Some details:
Currently supporting 7 coins: BTC, LTC, DOGE, QRK, FTC, CGA and DGC, more will be added soon.
Superfast: Superfast startup, blockchains synchronize way faster than on original clients.
Security: Your wallets (including private keys) stay on your computer, they are not transmitted to an external service or anything else!
Easy to use: Just download the installer (MS Windows) or the zip file (MS Windows/Linux/MacOS) and you are good to go!
Lightweight: The blockchains are usually below 1 mb each.
No scam possible: The software is written in Java, this means you can decompile the jar file (Google is your friend) and look at the source for yourself!