I'm sorry I don't know anything about their bike cover, but I do use their Tank bag and nylon saddle bags and find their quality to be above average. Seams and Zippers appear to have quality workmanship.
Their covers are good quality. I have one that is way to big since getting rid of my bigger bikes but it did its job and I've had it for years. I have a covermax which is great as well (for sale section if you are interested). Can't go wrong with either
I have a backpack/luggage component made by Nelson-Rigg and it is high quality. I hope to get their saddlebags for Christmas. I would say this is a good product even though I don't really have direct experience with their covers. Good quality. :bigthumbsup: