Haven't used it as much as I would like but it was a simple way of outfitting a standard length handguard/AR with a light set up without full blown rail system. I'm not into all the pressure switch gadgets so this worked well for an non-dedicated, rear push button on/off switch system.
Pros: Inexpensive what to attach light.
Cons: Not great, but good enough.
This review was written in the old system and had content requirements that are different than reviews written today.