You could always run FCPX on one and have a blog open complaining about it on the other.
Some people just like to complain about anything they can
Except there are perfectly valid reasons for complaining. You can get used to glossy but you never needed to get used to matte. You can adjust your lighting and seating position with glossy but you never needed to with matte.
There are artifacts with both screens - with matte, it diffuses light over the panel so it washes out blacks a bit; with glossy, you get a reflected overlay on top of blacks.
Neither artifact is nice. The reflected overlay can be very annoying if you are near a window with things moving behind you. Aha, just move the computer right? Yeah, with matte you didn't need to.
The word glossy is synonymous with glare and that's not a positive feature. It doesn't automatically make it worse than matte but it certainly doesn't make it better either.
Both types of monitor are bad and there needs to be a new setup where you get the benefit of a fully transmitting panel coupled with a non-reflecting but smooth overlay. There was a new technique developed a while ago but obviously hasn't caught on:
Removing the glass is one way to improve things a bit but doesn't solve the issue:
It's nice to have dual-display support on laptops with Thunderbolt but it's a shame you have to spend $2000 for the setup. Maybe someone will develop a Thunderbolt to multi-HDMI/DVI adaptor.