Just wondering if anyone has heard of/has any experience with the TTS gearset:

http://www.greenline.jp/catalogue/bccat ... +Gear+Sets

Has similar ratio's to the old TRD gear set 33030-AE851, considering purchasing for my t50 rebuild and looking for feedback on their quality.

I read that link as just 1st and 2nd gear being changed so 3rd 4th and 5th are same as stock.
With a 4.3 final drive 1st is quite high (33 -40 mph depending on available revs) but it would only be an issue on hill starts. A 4.778 final drive may be better but cruising would suffer.
Depends what you want to use it for really and if it is for competition that gearset fails to address the big gap between 3rd and 4th gear of the stock gearbox.
I had a very similar gearset (not the same) in my car until it decided to break 2 teeth off of 3rd gear. I think the fact that they sell an upgraded strength 3rd gear should tell you something

I am currently running a 4.778 final drive along with 0.737 fifth gear for highway driving, something else I am considering as well is the cusco type c set, 1st.: 2.701 2nd.: 1.696 3rd.: 1.281.