I recently experienced a small issue with my SXmini, and thought that I would wait until the entire RMA process was completed before posting..
I was swapping batteries, and noticed a small amount of e-liquid on the top. I had been using my GG iAtty, which is known to leak some through the 510 pin at times. Upon closer inspection of the SXmini's 510 connector, I found that the gasket around the pin had cracked. I know the electronics are sealed away from any danger, but I explained to YiHi that no vaper would want a device (especially at the SXmini's price-point) that leaks on the battery.
So, two days of e-mails and a pic of the damage to YiHi later, I was directed to contact the vendor I purchased the device from, with a forwarded request from YiHi for an RMA exchange. I informed YiHi that the vendor had no stock. YiHi contacted VAPRO (distributor for vendors) for me, and I had an RMA # and address to ship the SXmini to..
I shipped the device on Monday... was received by VAPRO on Wednesday... and the replacement shipped out on the same day. According to USPS tracking, it's 20 miles from me, and will be in action tomorrow.
I must say that out of all my devices, I REALLY missed using the SXmini.. I will HAVE to get another when the new shipments arrive with the modified 510 pin. I have no idea which revision I'm getting tomorrow, but since VAPRO is a distributor who moves many SXmini's, I'm hopeful that It may be the latest. If not, I know better than to screw around with the pin.. I just hope the gasket holds up without cracking again..
I'm impressed with YiHi's RMA service.. It only was a week to totally take care of the RMA, and have the device back to me. (If USPS doesn't screw-up within 20 miles of here...

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Here's a pic of the cracked gasket: