Well from what I'm picking up from this thread is the Cuboid is not all that. I don't get why JT can't build a better 510. I have problems with my VTCminis too that a small vinyl washer fixed under the atty since I use STM's pretty much all the time. I was thinking about the cuboid to get a couple more cheapos to have around but sounds like that is not the one to get. PB gave it a good review. My VTC's work just fine with the washer but not looking at getting another with the same problem. Maybe I'll look at the IPV5.