I ordered and received this pocket rig just the other week, which I was very excited to try out after searching extensively for a piece that would fit this purpose. The joint compatibility with cartridges (without additional adapters), the ease of the upright orientation for properly using oil carts, the angle of the mouthpiece and overall size were all exactly what I was looking for, just perfect.
After much anticipation, I finally had an opportunity to test this bad boy out over the weekend. I set the rig down on my desk, standing upright, and proceeded to get everything else ready. In reaching over my desk for a vape to use, the hanging bottom of my t-shirt gently grazed the rig, causing it to tip from standing upright over to its side, and that's where things ended.
The impact from tipping over from sitting upright, which was equivalent to the impact from a firm flick with your finger, caused the mouthpiece neck to snap clean off at the base. There was no chipping, shattering or other breaks, just a clean straight break of the neck from the base. While I acknowledge that its my fault for causing it to tip over, it's not like it fell off my desk a few feet onto a hard floor or I dropped it in the sink....the rig is only a few inches tall and light, so the impact from tipping just inches and its own weight should not cause any quality glass to crack, let alone break apart entirely. Maybe the one I received had a defect in the glass that made it brittle, or maybe it got bumped around too much and weakened in shipping, but there were no cracks or damage that I noticed before setting it down.
Given the EXTREME fragility of this piece, if it hadn't broken before I even got to use it, I can't see how it would have lasted for too many uses without breaking, assuming normal handling and washing. The one I got would most definitely not have stood up to being carried around in a pocket or bag where it might be subject to any kind of bumps or contact with other items. I really wanted to love this little rig, as it promised to be exactly what I was looking for, but it was a complete disappointment.