I'll comment on TSM from both mine and wheeling buddy's experience. For larger axles the TSM conversion works well - i.e. all applications using the 1978 caddy calipers (D60,D70, 14 bolt and 9 inch, i believe). My friend runs the conversion on his rear D70, had great stopping power and a functional ebrake.
On the other hand, I have a TSM conversion, which I bought based on my buddy's experiences, on my rear Scout II D44 in my XJ. This kit uses 1979 caddy calipers, which are substantially smaller. Braking is improved from stock drums, but the e-brake plain old SUCKS. No matter how many times I adjust it, it just won't hold on any kind of hill, and eventually stops working.
If you are putting the conversion in a pre-95 with a single diaphram booster, I would strongly recommend upgrading to the 95-96 booster. When I ran this set up in my 91 it made a world of difference.
Also, while Skip @TSM is a pretty cool guy, the other dude that works there is an ass. I had the wrong set of caliper spacers included in my kit. After several telephone conversations, they agreed to ship me new spacers, at my cost! As I was about to be stranded in the boonies (wyoming), I had to have the proper spacer machined, again at my expense. TSM's response was that wasn't their fault - too bad. Anyways, not the best customer service in the business. just my 2 cents...