High-quality build that feels really solid

Rubber side grips and subtle grippy texture

Amazing sensor that gives you ultra-smooth tracking

1000HZ that doesn't feel unstable

$69 price tag

No on-board memory

Didn't see any threads on it so I thought I would post my experience. This won't be the most extensive review ever but hopefully it'll help anybody interested in purchasing a new mouse.I am a former professional Counter-Strike: Source player that competed at the highest level. I was paid to fly out and compete on the invitation-only Championship Gaming Series that was on DirecTV at SXSW in Austin, Texas. I've won and placed top three at quite a few tournaments. My proudest accomplishments include winning Dell's College Gaming League and beating Team 3D (the second season CGS team) in a CEVO tournament.I've used the following mice during the successful part of my career (in order leading up to what I was previously using): Logitech MX510, Logitech G5 *shudders*, Logitech MX518, Razer Deathadder, Razer Deathadder 3.5G.Mostly everyone I knew back when I played either used a Deathadder, or an MX518. Lately, it seems like SteelSeries and Zowie have gained some market share, but they didn't have any back when I was playing professionally. I've never used any of their mice so I can't compare to them.I loved my Deathadder. I've always felt the ergonomics of the mouse was perfect for my hand. I never was super comfortable with the shape of the Logitech MX518. It was something I got used to, but the second my hand was in a Deathadder it felt right. I believe it's because they designed it to be very similar to the Microsoft Intellimouse 3.0, which was a popular gaming mouse before gaming mice were a thing, and even for a while after that. That said, the Deathadder never felt cheap, nor did it feel extremely high quality. When I got the newer 3.5G version, there was zero difference in feel or build quality, and an unnoticeable difference to performance (for me).On first sight, the mouse looks identical to the previous editions. But the moment my hand gripped this mouse, I was in love. It just feels...amazing. They added rubber grips to the side and a subtle grippy texture to the entire mouse that gives the mouse an extremely high quality feel. The build quality certainly does feel a lot more improved. It's amazing how minor details can accomplish so much.I installed Synapse 2.0 and I'm not sure what everybody is complaining about. Without on-board controls, of course you will need custom software to change DPI and other settings, and Razer made easy to install and well designed cloud based settings software. I also read that you can store your settings offline. I think people complain because they like to complain, but I see nothing wrong with the software and this is coming from somebody who used to have to take their equipment to many LAN tournaments.I immediately disabled the pulsating logo as usual, but the green scroll wheel trim actually looks really nice. I put my DPI down to 400 (yes, I use really low DPI, like a lot of top CS players). My old Deathadder was at 450, so I had to use a DPI calculator to figure out what to change my in-game sensitivity to in order to compensate. It turned out to be perfect. I used 400 DPI before was when I was using my MX518 so the change was easy.I went into an ESEA pug to test out the mouse. I swear I'm not joking, but I got the three most insane headshots within a few seconds of playing. I think it may have been the placebo effect at first that made my aim feel ridiculously accurate. After playing longer, it didn't continue like that, but there was a noticeable difference in the tracking and it felt more smooth than ever before. It's advertised as using a 6400dpi 4G Optical Sensor (not sure if that insane DPI amount means anything considering I play with it set on 400), but if I remember correctly the old Deathadder used an Infrared sensor. But this mouse says 6400DPI 4G Infrared Sensor on the bottom, so maybe Infrared and Optical mean the same thing to them? I don't know enough about them, so somebody else can elaborate if they know. I won't claim that this sensor is so good that a bad player would now be good just by switching from their gaming mouse to this gaming mouse, we all know it takes much more than a good mouse. But I do feel more of a difference switching from the Deathadder 3.5G to the 2013 than I did from the original Deathadder to the Deathadder 3.5G. Also, I am using this mouse at 1000HZ and when I used 1000HZ on my old Deathadder it felt inaccurate, where as it feels perfect on this.I know their mechanical keyboards get a lot of heat on here (trust me, I'm not a Razer fanboy, I just ordered a Filco), but there is no denying that this is a fantastic mouse. This is the best Deathadder yet, and I'm curious to know how it can even get any better.I give it 5/5 stars.Got mine from Amazon because it seemed to be on backorder on Razer's website.