First off, I was bit concerned buying these as new releases, as there were no reviews at the time to get a third party review. However, I know that MTX has a reputable name in sound equipment and gave them a shot.
For a little background info, I was replacing the two 6.5 front door speakers in my '04 Saturn Vue, and as usual Crutchfield sent me brackets and harnesses. In my scenario, everything went great! Clear instructions, perfect fits, and easy assembly-minus the fact that the bracket doesn't come with any screws. Luckily the MTX speakers came with some that fit perfectly into the bracket.
Sound wise: I am a musician and studio owner, and know what sounds good and what doesn't. These speakers sound great for the price, and give a good flat sound that allows you to use your head unit to tweak them to flavor. They are durable and the rubber surround and cone seemingly will last a long time.
I'd recommend these to anyone looking for a good 5-6.5 inch stock replacement!
Pros: Great sound, not too bright on highs--really shine when you run through a high pass filter
Good low end for the size
Came with screws, wires and clips for versitie mounting applications
Cons: Mounting bracket didn't come with screws, but it was included free-plus the MTX's came with some so no biggie..
Nothing else I can think of!