Basically, if you buy a batch 1 rig, then you should just finger cross that you are lucky.
I'm the bad luck one and also the good luck one.
I bought 8 Prisma and some of them not work very well. (Bad luck)
Now I have send three of them for exchange the new 2.0 Prisma, and if those three all good as expected, I will exchange other 5, otherwise I will refund those 5. (They will not refund the rigs if you choose exchange instead of get refund). ---so I am also good luck that I have the chance to replace the new batch ones or get refund.