I have been using a Yocan Uni Pro for a month or so. Highly recommend. Small, inexpensive, great battery with display (3-5 sec draw, lasts 150+ draws at a guess, maybe more but only takes about an hour to charge anyway!), variable voltage in 0.1 increments (2.0v - 4.2v), 10 sec pre-heat, adjustable height/width for different size carts is a nice touch, too.
I have also used Ccell M3 auto draw pen battery. Very good extraction but no pre-heat, no battery display and tends to fall over, which doesn't help when the recommendation is to keep carts upright.
Overall though, impressed with the Yocan. I think some pictures make it look a little "cheap" looking but the actual product in hand feels and looks a lot better.
I have tried DrEx and SCL carts without any problems in the Yocan.
I have also used Ccell M3 auto draw pen battery. Very good extraction but no pre-heat, no battery display and tends to fall over, which doesn't help when the recommendation is to keep carts upright.
Overall though, impressed with the Yocan. I think some pictures make it look a little "cheap" looking but the actual product in hand feels and looks a lot better.
I have tried DrEx and SCL carts without any problems in the Yocan.