As anticipated for the money I spent, these speakers were a minimal improvement over the factory Blaupunkt 15W paper speakers that came with my 2008 Chevy Colorado LT Crew Cab, which had terrible sound to begin with....I hooked 4 of these up to a Planet Audio 150x2 amp, in parallel by side (L & R), giving about ~37.5W RMS per speaker @ 2 ohms. I also tried running them directly from my Pioneer FH-X700BT deck, at ~14W each, and they sounded about the same as the factory speakers. This amp sounded great with my old Boston 6 1/2" speakers I had in a previous vehicle. Even with the Speaker Baffles in the doors, they just don't give much of a punch at all, and the highs leave something to be desired. I added a set of 3/4" Tweeters to make up for it, but the audio quality is still not the level I'd like. For the money I spent, I can't complain too much, as they were an improvement, if only minimal, from the stock speakers. I'll be adding 8" subs in the back seat to give me the bass I want, but I may look at replacing these door speakers for a better mid to high range sound in the future.
Pros: Cheap, easy to install with the included kit from Crutchfield.
Cons: Not much low range to be had, mids sound OK, highs are weak. Recommend buying either a more expensive set of 6-1/2's, or a set of tweeters to offset this shortcoming. Minimal improvement over factory speakers even with an amp.