A few weeks ago I got the Stingray with the 633. My first impressions are really positive.
Beforehand I was a bit worried that due to the size(tallness), the bag would be in the way when walking, but this is not the case. It fits very well around my 'athlete trapped in a writers body' belly with the petrol harness.
The zippers, storage, handles and general layout of the bag works very well for me. Good job!
There is only one (minor) thing I have trouble understanding the benefits behind, and that is the rain cover.
Maybe this is due to the fact that I come from a petrol bag that has one half the size...
We all once have asked ourselves the question, if size does matter, and I'm sure K-tek has thought about this too...
With velcro the cover can be removed entirely which in most cases is the way i'll use it. In case of rain it can be reattached if needed with plenty of space to get you hand under it to still play with the knobs. But here is my thing, I also like to protect/seal my bag with the cover in case i'm not working or traveling to protect it from dust, sand, rain and other dangerous substances alike. In this case I want the handles out but the cover closed. And this is were I have not yet found the benefits of such a large cover. There is a way to close it, but in that scenario one of the handles is blocked too. I've attached pictures to illustrate my point. It might be personal taste and I think with a bit of diy/sewing here and there it is easily customizable. If others have found better solutions to this 'problem' I'd love to hear it.
All the best,
Lucas