I own 3 of these Telstar Telwave amps. 2 dx350s and 1 DX500. 2 I have had for 10 years I baught new from the builder and the other I got used off ebay. 1 is a 2 pill 2879 heat sink only no cover but the other 2 are 454 amps 1-2 pill and 1-4 pill with plastic covers. All 3 are great amps and have features no other cb amp and some HF amps don't have. Reverse polarity protection, over heat protection, swr protection and Bias/ high swr protection. It's basically impossible to hurt these amps. I seen where people complain about the plastic housing. These amps never get hot enough to even bring up the fact some are plastic. Another of these guys are diehard supporters of XForce, Dave made, Texas star etc but I would be willing to bet, if any of these guys ever used one and abused one like I have and had no issues they would become like me and never buy anything but. I will never buy any other amp unless it's very cheap. The builders is still making amps that are far and beyond other builders. Not sure if the videos are still online. He has removed all the videos of the amps he no longer makes but his new stuff are something to see.