My old supporter has started to fall apart due to years of abuse so I decided to get a new one. As I was placing my order, I saw that SD has a new alloy cup so I decided to give that a try as well.
Shock Doctor Titan Flex Alloy Cup
The alloy cup is almost the same shape/size as the Flex cup (of course, it lacks its flexibility). It looks pretty nice (I know that's really low on the features list for a cup) and gives impression of a product of high quality.
I have used it a several times in combination with SD X-FIT Supporter and find the combo much more comfortable than my previous supporter/cup (some generic model). I am used to wearing a cup, so it might have something to do with it but I found the alloy cup to be great fitting and of a really "low profile" for a cup. Compared to my old cup, it has a much nicer fit that doesn't make me look like a (complete) weirdo when wearing VT shorts.
I am not much of a stand up guy but I do a lot of half-guard and leg locks where wearing a cup is a must (at least for me), and I must say that I'm really pleased with this product. If you're in a market for a steel/alloy cup, give this one a look. To me it looks like a good alternative to a standard thai steel cup.