AVOID PEEL AND SEAL AT ALL COSTS!!!
No matter how many people have used it, it's not worth it. It will leach, especially around the transmission tunnel. I just spent 40+ hours removing that shit from the '71. There wasn't much of a smell, but my carpet did get stuck in a number of places and it was ruined when I removed it. Don't waste your time with a cheap product, the money you'll save now will bite you in the ass later when you have to fix something else. If I could go back in time I would have not bought any of it and left the OEM stuff until I came around to spending a few hundred on better materials.
I spent a lot of time this past summer reading all of those diyma posts and whatever else I could find. In the end I went with the SDS stuff, IIRC it actually was a bit less expensive than an equivalent ft^2 of dynamat extreme and weight vs damping was so close I'd consider that irrelevant. Or maybe the same damping you'd need less ft^2 of SDS...I don't recall right now.
When applying it, don't cover every square inch like people(myself included) used to do. Read that diyma thread linked above and the SDS website. I haven't gotten to doing it in my 02 and likely won't for a good while. I did do the whole shebang to my daily last summer though.
--My experience with the full sds product line & install, the "short" version.--
Not a direct comparison obviously, but I wanted to make my '91 volvo 245 a better "daily"/travel vehicle while keeping the interior oem-ish. I ended up going the SDS route and bought the CLD tiles, MLV(ebay), and HMF. I also bought some "EZcool" from http://www.lobucrod.com/. I used that on the sides and ceiling, CLD tiles on the everywhere, HMF on the ceiling + sides, and MLV/decoupling layer on the floor + sides. CLD tiles are for damping vibrations, MLV is for "blocking" noise, and HMF is for absorbing. The EZcool is for heat management and does next to nothing for sound dampening. I found a sheet metal shear(think giant paper cutter) was the best way to cut CLD tiles. Razor blades worked for everything else.
It took a long f*cking time to install everything. Like the 02, the door panels sit on the door unlike a modern car which often has space between the metal and plastic interior panels. This made install a huge pain, lots of layout, test fit, cut away, try again... Installing the MLV was a huge pain too. Getting the carpet and seats to fit again after that small change in floor thickness was a battle. In the end, the car is quieter and more bearable in direct sun(ez cool). It would probably stay cooler if the AC worked at all. I drastically changed the stereo at the same time, so I can't use that to compare before/after volume level
On the 2002 I'm more concerned with causing rust in the future due to trapping water, especially with it condensing on the sheet metal between the metal and the HMF or ezcool. I used 70ish CLD tiles, 7-8 hmf sheets, and a fair bit of ezcool which came out to 25-30lbs. The mlv was the killer at 70lbs or so. I'd expect 20-25lbs in the 2002 and I'll likely skip the MLV.
Would I do it ALL again? No. It was not a big enough difference to make it worth while IMO. Maybe if I could do a side by side test with another 245 and a sound meter it would be noticeable. I would do the CLD tiles all around and maybe the HMF+ezcool on the sides/roof. My doors do make a satisfying thud when I shut them now...