To my recollection, I've not seen a DSS wing. The non-removable/repairable bladder would be a deal breaker for me as I'm a DIY sort of person. Other than that, what leads you to say the above? I too have Oxy and VDH wings and I'm impressed by the quality. I've never had a pinch flat. The replaceable compression fittings and seals are certainly a bonus, not to mention the fittings are not bonded to the bladder. However, I was given to understand the DSS wings also have replaceable fittings.
Cheers,
Couv