The profile amp looks like an amp that could be found at a swamp meet, but crutchfields sells the line so it must mean it meets their standard. Which Type R sub do you have: The SWR-1221D or the 1241D? Difference between the two is that one's a 2 ohm and the other's a 4. Power handling are the same.

I don't wanna put down a amp just cuz i never heard of it before but yea it'd be best to do some research on it before you purchase, especially if you're going to buy it from ebay. Gotta watch out for refurbished items. Also the amp you linked could be an older generation model.