Other than not being able to keep my original name, no problems. Make sure to go in and get the 'reward' for switching over, located in the 'items' section of the C-Store. Oddly, not the legacy unlocks section where they always put these things. I didn't get anything particularly useful (yay points boost for a VA50 player! got a couple engine/aux boosts and a purple MK XI hand phaser as well), but worth grabbing i guess.
Much ado about nothing, in the long run, but yet another half-assed effort from PWE/Cryptic. Lie about it, say you won't notice a change, then just dump something in there and don't respond to problems when it's half-tested. Little shit like not being able to use your names, not keeping posting history or join dates, no custom avatars, etc. You know, the stuff that should work by DEFAULT in a BBS system, and shouldn't have taken any effort. I'm sure they're "looking into it"...
Yeah, it's not so much the change as it is the horrible way they've implemented it. A monkey on acid could have set the forum up better than what they managed in an entire day. They didn't even finish the style sheet. You see mauve, sea green, and tan buttons on a black background with silver finish, as well as jagged white borders on the buttons themselves. The post demarcation lines don't extend all the way down, so some posts look like they're broken. Many of the links don't work, or didn't when I linked my accounts. It's half assed in every way. Hell, I didn't even get to keep my name.
I do hate that I can't customize my own avatar, though.