So, I ended up getting both (no one called this ahead of time? LOL)
The Maverick has a really long head especially when compared to the Buck and the Mustang. I usually feel like I can insert a toy's head through my external sphincter and let the tip rest against the internal sphincter and then just let the external close and relax a bit and let the internal one open up. I can do this with the Mustang and the Buck, but the Maverick has such a long head that just keeps going.
I'll also say that the Maverick is just huge, it's thicker than the Buck, and mine feels a lot softer than my Buck. But, holy hell, it is thick. When used internally the Maverick just makes me feel like I'm constantly being pried open. No matter how much I relax the Maverick just feels like it is still expanding inside me. The Buck is firmer and feels like a fully hard dick, the Maverick feels like one of those guys that just keeps getting bigger and harder the longer you fuck.
When I first popped them both open I thought that I might send the Buck back because the Maverick just looks so pretty, but now that I have used both I currently like the Buck more and feel that it is slightly thinner (But still thick) and easier to thrust with. And the Buck has a different feel to the Mustang. Not better or worse, just the usual Vixskin awesome.
Hmm, I really need to work on finishing my reviews, lol