Very feature complete, easy to use, with good pre-amps and DAC. It'd been nice if it had ADAT for more inputs, but I can't complain -- it's has everything you need on an entry level and is well worth its price.
Nice USB audio interface. Specially for the price of ~150€. Nice quality, great sound, I've been using it for a long time and it still works perfectly. The reason why I have picked the 2i4 was the MIDI input.