has anyone used this amp?

The i-force series amps are a Japanese made version. While they are a decent amp for the money I personally don't understand the value of risking their reputation with these imported models, as the SQ is nowhere near the same of the Reference, or yet the C2K lines.

Zapco is a very reputable manufacturer in the SQ aspects of car audio, as stated, the Reference and C2K models offer extremely high end sound quality. With their Symbalink technology, they are far above the industry in terms of signal strength and versatility.

As for the i-force line, personally, I think it is nothing more than a tweaked up Sony, with a Zapco emblem.

Here's the scoop on Zapco i-Force amps straight from the horse's mouth:

I wish there was a good magazine / website that put major brand's competing products head to head like the computer industry does. 

I mean, I really would like to see every amp in the i-force 2100's class range reviewed by the same place. 

Thanks for sharing that letter, DYohn.  That's some interesting stuff.  Now I'm trying to guess the "brand starts with P or D or S"...S for Sony?

Hmmmm.......DYohn, now that it has been put that way, I have a whole different perspective of them, from the way it was introduced to us, seemed that they were trying to run it up there with the Reference and the C2K, so I really felt strongly that they were risking reputation with the introduction of them. Because I have heard a few of them, and they sound pretty good, but not near that of the "Zapco" sound that I am used too.

But now I understand the point, its just Zapco's way of expanding their horizons so to speak. Just trying to build a more affordable amp for the average everyday listener.

Thanks for the post, made a 90% turn around on the opinion of myself and others around our shop.