NANO may be the only currency in existence that can make all of these claims. It's:

Fast Feeless Energy efficient Decentralized Has a finite supply Is simple to Use

FAST :

Transactions take about a second.

FEELESS :

Send any amount of NANO anywhere in the world as many times as you like with ZERO transaction fees.

ENERGY EFFICIENT :

NANO transactions require a very small amount of electricity compared to "mined" currencies.

DECENTRALIZED :

Centralized digital and fiat currencies are subject to their issuer’s rules and fees. NANO is a grassroots open-source project. The transparency of distributed ledger technology also makes it perfect for publicly funded entities like charities and governments to prove their integrity. This free to use currency can strengthen local economies and improve living conditions globally.

FINITE SUPPLY :

Unlike traditional currencies, no one can print more and diminish everyone else’s spending power.

SIMPLE TO USE :

There are many digital wallets to choose from. Each new wallet is given a unique passphrase to be written on paper and stored in a safe place so that it can be restored if the device is lost or damaged.

Sending NANO is as simple as scanning a QR code with a phone’s built-in camera. A public QR code address can be displayed on a receiver's phone, web page, video, t-shirt, business card, store wall, etc., making it very simple and versatile. - An efficient digital currency for an emerging digital age.

(a NANO Receiving Address)

In conclusion…

The community is a friendly bunch who are still working on tools and toys enabled by Nano.

Sources:

NANO's instant transaction speed

https://nanospeed.live/stats

Bitcoin's high transaction fees

https://bitinfocharts.com/comparison/bitcoin-transactionfees.html

Bitcoin's slow transaction speed

https://coincentral.com/how-long-do-bitcoin-transfers-take/

The hassle of using Bitcoin Lightning Network – See: Making My First Payments