Well i recently purchased a JBL GTO75.4 II for my interior speakers. First off i would like to say that this amp looks really cool, partly because you can see all of the internals which is bad ass in my opinion. Onto the performance, you can adjust the input levels for both the front and rear speakers as well as how much bass and treble you want. The output is amazing and everything sounds crystal clear. The only downside is the amp is a little big roughly 15" wide x 12" deep x 2.5" tall.

Over all i would rate the amp 9/10 functionality and ease of use and 10/10 for appearance.