I bought this on Keith's recommendation, but had three reservations: First, the cup pocket closure is by velcro. This is a little hard to get the cup both in and out, and there's nothing worse than having to fish around in your duds before and after class - especially in a public park. Second, the 'flex' version of the cup has had some negative reviews: some users have found that it flexed so much, they still received the impact; the flexing is also helped by some cutaway sections in the cup that have apparently pinched some skin upon impact. Ouch! Finally, who wants to wear white underpants? Apart from the practical factor of keeping them clean, they're a bit of a beacon if you want to change clothes at the end of class - for example, from fencing pants into regular jeans.
All of these issues are solved by another Shock Doctor model, the Core Compression Shorts, model number 221, with their Titan Alloy cup: http://www.ebay.com/itm/Shock-Doctor-Co ... 5894a6aa21
(Apologies for the eBay listing, but this combo doesn't seem to be a standard offering on the Shock Doctor site.)
The 221 pants have a fold-over flap at the top of the cup pocket. While getting the cup in is still a jiggle, it's very easy to take out, yet still remains firmly in place under movement. The stainless steel cup eliminates the flexing and pinching issues - and, against steel in sparring, I'd rather trust my bits to stainless rather than plastic that already has gaps. And the black shorts don't look too different from bike or running compression shorts, so changing in public is far less of an issue.