'boing boing boing B'DOING boing boing BOING ... (that's what 36B sounds like when it bounces)'
Strengths: Comfortable. Doesn't look like a major piece of civil engineering. Simple. Good choice of colours.
Weaknesses: Doesn't work for me. OK for climbing, hillwalking, yoga and cycling; nowhere near enough support for running. I am a 36B so not particularly big-busted.
Overall: I bought the Medium (32" - 36") A-C model of this bra. I'm 36B and run between 40 and 50 miles per week. Sadly this bra is useless for running in; offering approximately the same level of minimal support as a tank top with a basic shelf bra. I have previously worn M&S (fantastic performance, great VFM) and Shock Absorber (great performance, hideously expensive) bras for running: the SportJock bra does not come close to even a 2 year old M&S bra in a comparative bounce test. I had high hopes for the Sportjock, and am surprised at how poorly it performed after so many people have raved about it. I suppose that you can't have it all - that nice soft fabric and the lack of copious volumes of industrial-strength elastic comes at the price of effective support.