Anyone here have one?

I'm in the market for a light bag for backpacking. Unfortunately, I toss and turn quite a bit in my sleep and just don't like the constricted feeling mummy bags. From what I've read the Mont-Bell bags flex quite a bit and may just be the ticket for me.

All their bags come in two sizes, regular (up to 5'10") and long (up to 6'4"). I'm 5'10. Will the the 5'10" sizing of the regular size be roomy enough for me since I'm right at the edge? Or would I be better off going with the long size and having a little extra room to spare?

Of course there aren't any stores within reasonable distance of me that actually have them in stock. The places that I've talked to that carry the brand (jackets/clothing) are more than happy to order one for me.

If anyone's got any first hand experience with them I'd like to hear about it.

I have not had one but three guys I know do and they love them, Now as for the Reg bag should be fine but if you like to stretch out most of the time it may feel a little tight. But if you side sleep you are good, I am 5'10" and use a Reg that the cut off is 5'10" and it fits fine