We know it’s a good machine because it’s the successor to the Apogee Elite which is one of the best as well. The Apogee Elite is an alexandrite and yag combined into one, so you can use either. GentleLASE is a bit better because it has a fixed 3ms pulse width (lower is said to be better for hair removal) and has an 18mm spot size. The Apogee Elite has a 15mm spot size so bit smaller, but has an adjustable pulse width going as low as 5 (but seems like most places go much higher like 20).
The MPX gives the 18mm spot size of the GentleLASE but has the new technology to fire alexandrite and yag at the same time. Unless the cost is obscene, I wouldn’t even consider anything else if I had that machine available!
I also know it would be good as I’ve had many treatments with Apogee Elite (see my signature) and had amazing results. So the MPX is even better so I’d assume even better results.