I have a two trees tts-55pro, its cheaper, but no enclosure.

I would strongly recommend not relying on the enclosure anyway though, and make sure the glasses are actually capable.

I tested my glasses by putting them between the laser and a sheet of paper, and ran the laser at full power. If the paper is clean, its a good sign. Does mean my glasses have a big burn on the lens in front of my pupil though :D

I start my jobs and get as far away as possible, just to be safe.