I did SCT (static contraction training) training for a 10 week period as a routine, much like doing any other routine. Pesonally I experienced growth the entire time, both in terms of increase in weights used (as my training log demonstrates) as well as in weight gain (I believe I put on 3 lbs during those 10 weeks, haven't checked in a while, maintaing my body fat.) I know it goes against the grain according to alot of posters here (although I know one of the Authors (TC or someone here mentioned the fact that SCT / PFT DO have their place in a training regime.)but honestly, I don't know how anyone could even argue that holding a weight at optimal load would not increase strength.
Is it the best workout? Of course not, what is? Is there an over-training fear for your CNS? I guess, if you fear those things, but why fear over training? Train hard and if you hit a wall due to over training, back off. Holds true for any program.
Loss of full range strength? I don't know. I think alot of people say yes, but my opinion is that is not the case. Instead, what is the case is that since you haven't done a full ROM in say 8 weeks or whatever, you have lost some technique, some memory of the movement etc. I know for me that is more the case as my next routine pushed me past previous held maxes. Just took a week or so to get back in the groove.
Anyway, to each their own, don't go into it thinking this is the cure all, but no reason to discount it either.
I know I will probably cycle in an SCT program once a year or so, help bust through plateaus etcetra.