I suspect that you're going to love them. Make sure to report back on this thread to let us know what you think! Oh, and give them some time to "break in" before passing judgment. This can be a matter of you getting acclimated to a new sound as much as the drivers physically limbering up through use. I can't even remember what my Pro-80's sounded like brand new, (must have been pretty good, because I kept them) but 5 years later the sound is fantastic.
Also, and I hope this was mentioned on the site, I'm pretty sure that the Pro 250 (unlike the Pro-80 and Premium models) comes with a coiled cord, which some people like and some don't. I prefer the straight one. Also, remember if it clamps too tightly on your head, you can always lightly bend the headband out to loosen it up. Partly through use and partly through manual adjustment, mine seem quite a bit looser than stock but extremely comfortable.