I have their steel backplate, 60 lbs wing, a 10W HID light, and their O2 analyzer. I am happy with all of it.
The plate has all the holes drilled and smoothed- there is a slot for 1" and 2" crotch straps so that you don't need to drill or cut the plate to switch between the sizes. There are three holes for mounting the tanks so there is some flexibility with trim. I've never used it for single tanks, but it looks like there are slots in the plate for a cam band, so I suppose it could be used with a single tank.
250 dives and 2.5 years later, and the BC and bladder still look good. Both the inner bladder and covering are tough as nails- no snags, cuts, or tears. The inflator hose is showing a little wear at the elbow. The hose might be a bit long for some tastes. The inflator has been maintenance free.
I like my 10W light. I did have to send it back to fix a faulty switch after 2 years, otherwise, it has been trouble free and DRY!. I throw it in my gear bag with my liftbags and sausages, but other than that, it doesn't get a beer cozy or special treatment. The head is super compact, but it isn't focusable. I plan to keep it when I "upgrade" to a focusable HID light.
I also have the O2 analyzer, which is 2.5 years old and still on the original O2 sensor, although it is approaching the end of it's life. I don't do anything special (put it in the fridge, cap the sensor, or store it in a zip lock baggie full of argon, etc.) It just sits on the shelf in the garage.
I also have several of their SPGs- the small and the large one. I think all of these are essentailly made by the same Italian company, so they are proabably equivalent in quality to other manufacturers.
OK, while I'm listing all my gear, I also have 2 spools- the 75' and 150'. I put #24 line on them and they hold plenty of line.
I've never used their regs.
I think some people discount OMS, but I think they make solid gear.- just pick and choose the pieces that fit the diving you do. I should also disclose that I only dive in fresh water, so that helps keep the gear looking good.