These are very popular guns and from what I read are actually made by Fluke.
I ordered the MT4 which has an 8:1 ratio not the 1:1 of the cheaper guns.
Even some of the guns at this same price are 1:1 (Odonell 39.99 +ship) and run on watch batteries.
This unit uses a 9V battery available anywhere and this units retail is 89.99 so yes I think it is a good gun.
Mugen MRX4X - Picco P9 EVO