It depends on how desperate you are. I got desperate a few weeks ago and played around in them. The upper hole is deep enough to cartwheel in, but is not that retentive. I could hit three--maybe four ends before I would get kicked out.
The lower hole offers pretty much endless flat spins, if your techique is good. be forewarned it is maybe a foot deep on the green side. I would say the potential for face scrapping/ paddle damage is pretty high, but hey you can flat spin. also on surfers left you can do some kind of weird low angle blast wheel thingy.
is it worth the drive from the springs, probably not. go run the gorge royale instead. Or drive down to the salt--it should start flowing big once it warms up.