I'm not a super competitor like many of you folks here. I lurk a lot more than I post, and you guys are a great source of information!
I recently picked up an SP-01 Tactical, and gave it a spring job with MCarbo springs. For a base gun to start out with, the factory SP-01 was awesome. With the spring kit, it's fantastic. Single action has no creep and a light, crisp break, which was the most noticeable improvement. No malfunctions or other problems after doing it, either.
Don't get me wrong, I'd love a TSO, but it's just not in my budget. The SP-01 has proven to be a great pistol so far, and even better with a spring kit.