So, held further comments even though I had some. I had just ordered a refill with Maximus and went with prop - wanted to get it and try. For me, zero soreness in either glute, minor sometimes in shoulder... really more an irritation. So, this is typical reaction to the ester and for many folks (I've read) after a few weeks you get used to it.
A lot of this thread turned into prop crashing out - that's what I wanted to comment on since it didn't seem right. At 100mg/ml that would be odd for a legit rx. Technically, 100mg/ml is the strongest you can make prop w/out going super high in the solvent, which could be more irritating and even then may still crash. Mixing with another oil is really to prevent crashing (i.e. could turn 100mg/ml into 50ml, but realistically, some of the UG stuff at 200mg/ml+ is where it would work making it go from 200mg/ml to 100mg/ml or less). Not at all what I would expect from a pharmacy and now that I have my refills, I can confidently say, it isn't the problem.
Obviously, my expertise here is researching - a lot. I completely understand the chemistry behind it, which then makes translating the discussion between t prop crashing and "simple" reaction the the ester itself very easy. We are only experiencing the irritation from the prop ester itself, not prop crashing out of the oil.
Some will tolerate less than others. So far, I'm with Chip and love the stuff - treating me awesome. Unfortunately, TR wasn't so lucky :-(