The Supertrapp pipes were of a bit less quality than I expected considering their retail cost. Note however that they have the lowest dealer cost of any pipes offered. While the dealers get what they pay for, the consumer may not, as they have among the higher prices for non carbon pipes. They actually broke the welds that affix the canister to the input pipe, but the design is such that the cans just shake but don't fall off. Supertrapp agreed to replace them, but they want 3+ weeks to do it. Oh, and they do sound good and also look similiar to the stock pipes (which is what attracted me to them to begin with). Got em fixed - but I didn't get them replaced, I had them welded after I discovered that the design is a press fit from Supertrapp and would just break again.
TBR slip-on's I love them, especially the look and sound of the high pipes, but must honestly say that they were designed on a CR, and it's a real tight fit on a SS (or SP) with the wider swingarm. It's a bitch to make them look even at all, but they sure are beautiful. The cost is good, too. I put them on my wife's CR with "low-pipe" S connectors I later bought separately.
Staintune's stainless steel slip-ons have mechanical baffling, giving them a unique sound and do not require repacking. Staintune's stainless mufflers also come with restrictor tips which makes them like two sets of slip-ons: louder and quieter. They have something of a raspy note.
Since the diameter of the head pipes are larger than the stock header, only the staintune spaghetti slip-ons will work with the spaghetti header. One could try to get a fabricator to make an adaptor to sleeve down the spaghetti header to fit normal slip-ons.