Evolution two-stroke glow engines are manufactured by Sanye in the People's Republic of China. Sanye is also the manufacturer of Magnum engines and ASP engines as well as their own Sanye brand. The Evolution glow engines are manufactured to different specifications than the other three brands (different crank case and exhaust design, etc.), but the overall manufacturing quality is very similar.

With the Evolution .46 NX now selling for $119.99 (Horizon) compared to the O.S. Max .46 AX's price of $134.97 (Tower), there really isn't a big cost advantage for the Evolution .46 NX. While I don't personally own any Evolution glow engines myself, I have seen them successfully flown and I know pilots who have them and like them. I wouldn't try talking somebody out of buying an Evolution glow engine if that's what they decide that they would like.

If you really want to save some money without compromising quality in any way, I'd recommend that the superlative Thunder Tiger Pro .46 be added to your shopping list. Readily available in the $85 to $95 price range at a number of vendors, the Thunder Tiger Pro .46 is every bit the match in quality, reliability, power, and user friendliness when compared to the .46 AX or .46 NX. If all three engines were the same price, I'd still buy the Thunder Tiger Pro .46.