I don't know if I would purchase the combo of T3/Clen. If you want to try some T3 and Clen, I would buy them both separate.
If you buy the combo, you won't be able to use different dosage combinations. For example, the concentration is 125mcgT3/125mcgClen. I took 125mcg of Clen and I likes it, but I don't think I want to go that high with T3. With the combinations, I don't think you can use these substances as effectively for you.
Taking them individually, you can make doses such as 125mcgClen and 50mcg T3. The combo is cheaper, but on the long run I think individual bottles will better suit you.