The BBO was designed for a spacious hammock-the BlackBird so I've never felt hemmed in with it on. I haven't gotten the 10-20F boost some have but I have confirmed with an inside/outside thermometer 7-9F boost and note that was using a tarp.
BUT, and this is a small thing. Some of us don't use the tie-outs on the BlackBird..to use the BBO most effectively you need to use the tie-outs--no biggie, just something to know.
Paul did an abs. amazing job fitting the BBO to the BlackBird! Paul must be an amazing guy?