They are pretty comprable when it comes to results. I usually use the M105/M205, however, I have used the Gloss-it evolution cut and Gloss-it evolution extreme cut. The only difference that I have found is that the Gloss-it products can be used without much effort and still get amazing results when used in direct sunlight, when the vehicle surface is hot and when it is quite humid. Aside from the cost for such small bottles, the Gloss-it products compare very well to the Megs 105/205. As said before, he may be more comfortable with the Gloss-it products, and if that is the case, let him run with it. I assure you that if it is done correctly, you will not even be able to tell which of the two product's he used.