He will say, my signature Charvel is the best you can get, A few months earlier it was his signature Suhr, wonder what its gonna be in another few months...
Let´s bring a little nuance here.
Guthrie never said that his signature is the best you can get, only that he his guitars really pleases him and that people might like them too if they have the opportunity to check them out.
Some artists do switch endorsement deals like underwear, some don´t. Steve Vai, Yngwie, Satriani and a few others stayed their lives up until now with ´their´ brand. Eddie Van Halen is on the other end of the spectrum.
It´s been known that Guthrie owned or played publicly Fender Strats, Jazzmasters, Ibanez Jem & RG, PRS, Suhr classics, Standards and Moderns in the past, owns a Gibson SG from 1963, and a 335 among others.
The man likes his guitars to be diverse to say the least.
Guthrie was officially with Suhr from 2007 to the end of 2012. He is now official with Charvel. No other endorsements, only these two, although i hear that Red Bear Picks has something special in the future.
It´s not based on facts to say that he will change brands again in a few months just to make a quick buck. I guess we will see.
Anyway, here´s a pic of the Charvels, on the right is the Floyd Rose model and the one on the left is the Gotoh 510 with the bent steel saddles.