Discussion is about stock wobble... not cheek weld. I considered the STR, for the storage aspect, however I went the CTR route because a wobbly stock was more of a concern for me. The STR does not have a friction lock, does it? I have tried several stocks that wobble less than the OEM stock however none locked down like the CTR (and possibly the Safariland). Cheek weld is very individual and subjective. What is great for one shooter is not so great for another. However a stock that does not move a bit is objective. My CTR, with friction lock engaged, is rock solid.
The below video compares the CTR to Magpul's MOE stock & explains the friction lock and shows how there is no wobble with the CTR.
https://www.youtube.com/watch?v=X06l_rf5HAA