eclipse avx5000

Hello, someone I know is offering me this head unit for around 650 used for a few months. This is a friend who lives about 10 hours away, So I have never played with the unit or anything. I know eclipse is a great company, but Would this be better than the Alpine IVA-D310 new for 800? Haha, any help would be greatly appreciated, I want to move on one of them soon. Also, I only have a sub amp right now, and loudness wise, my speakers get high enough for me, would it be beneficial to add a small amp for the 4 channel, and rewire the crap out of my vehicle? Thanks99 Blazer LT.   Yellow Top. Big 3. Infinity Kappa Speakers All Around. Jensen CD/DVD flip out. 2 Infinity Kappa Perfect 12DVQs powered by a Alpine PDX600.1 (in one custom box, building a FG box)

please someone... i heard these are good, how is user interface and everything?99 Blazer LT.   Yellow Top. Big 3. Infinity Kappa Speakers All Around. Jensen CD/DVD flip out. 2 Infinity Kappa Perfect 12DVQs powered by a Alpine PDX600.1 (in one custom box, building a FG box)