I left a shop I was working for and needed an AC machine to do both R134A and R1234YF. I looked at other brands such as Robinair etc. yet was really expensive and I was Self Funding my own repair shop. I had a manual kit for the first 6 months and It was a Real pain the the A** to operate and just took too much time. I found this machine and it had good reviews on Amazon So I ordered one. I have been using it for just over a year now and Zero complaints!! Works Flawlessly!! Its fast and really easy to use. The customer service when I had a few questions was also very good. I have nothing bad to say. Don't hesitate, it works great!! My shop exclusively works on Mercedes, BMW, and Audi. Again, works awesome.