Initial value's pretty good as they will do ~1200w or so at 1 ohm. If it lasts a while $100's a give away.
When the first version of that amp came out ('01 - 1200D), it was one of the "hot" inexpensive amps across the forums ($230) - kind of like Hifonics has been recently.
Some defects in the design led to a lot of failures, and by the time Lanzar caught up the HF's and JBL BP's were coming out and those Lanzar's were basically a thing of the past. A couple revisions and a color change and you have the 1800d.