Previously had a SE2/Sport Loop and didn't really sleep with it on for some reason, switched to the Trail Loop with the U2 but felt a bit too big to sleep in. Tried a braided solo loop at the store and loved it, purchased a knockoff as they're adjustable and been sleeping using that, works with both the SE and U2.
Have a ordered a knockoff braided solo loop without the buckle, will see how it fits as without a buckle or double strap (like how the real BSL's are) it felt nice.
For day to day, I use a Alpine in L, loops in to the 2nd or 3rd loop, the best part is the g hook is on the side of my wrist and doesn't bash into whatever I'm leaning my wrist on.