^^ Kinda what Dizz said. As the 4.0...you go from being the hunter to the hunted when moving from 7.5 to 8.5. I generally like being the weaker/est player on the court (because those are the situations I tend to learn the most from)...but I don't relish being in it when I'm lucky to just merely get the ball back and not get my partner killed. You gotta know your limitations sometimes.
But the folks who play Combo (mixed or same-sex), at least around here, are generally very competitive and usually at the top of their NTRP. Still, I usually see at least one huge mismatch in a 3-line team match. 7.5 can be fun, ok, usually is fun. 8.5 is far more serious and the skill levels ramp up quickly.
A 3.5 masquerading around with a 4.0 mask on.