I've done it a few times and unless you have absolutely zero (indoor) conditions it's horrible. Even the slightest of air movement and it's not worth it. I will either fly a standard 1.5 on short lines or (more likely) turn to single line gliders. If rev came up with a 1.5 size that fit in between the standard and indoor and could take the sand and concrete, I think everyone would want one
The SUL fits in between nicely but you would have to move fast to get off the shelf. The other option is maybe a Pro Std done as a SUL.
I took my Indoor outside yesterday for its first flight. We've been having zero wind now for a couple of days. I must say its a different animal and the 10 foot lines make it right there in your face.
I'll be doing it again but ONLY in zero wind. Not going to risk it. I'll fly my SUL if in doubt.