I've got a 92 Blazer and I have installed nice, comfy, powered leather seats from an 06 extended cab 2500. I did have to drill a few holes through the floor to get them bolted in. I also had to run power to the passenger side.
For me, the only drawback is not having much room between the seat and driver's side door to reach the seat controls. Honestly, I didn't think of it when determining exactly where to place the seat. I made sure the door would close, but didn't think of getting to the seat controls while the door was closed.
The benefits of having the newer, more comfortable seats far outweigh that drawback. I'm sure I could drill all new holes and move the seat towards the middle a half inch or so, but it isn't worth it to me.
The seat belts are built in to the 06 seats, so I removed the 92 mechanism.
When I bought the seats, the guy threw in the console as well. My old original one was torn up when I bought the truck, so I've actually got the 06 console sitting in there. I had to accommodate for the 4wd shifter, which I did partially by taking it out and turning it 180°.
I've still got to finish my wiring for the console and I'll also be fabricating something to bridge the gap between the console and the old dash. I plan to add a USB plug or two and a few switches when I figure out my final design.
I did not get the 06 door panels. I'm planning to make some custom panels.
I'm so glad I changed the seats and console, it is so much more comfortable!
Hope my experience helps out!