The UI gripe is a big one. As I said, I'm far more comfortable paying for content. Charge me $5 for each class's Act 2 and another $5 for each class's Act 3 (and grandfather in characters who are already in a given Act) and I'd cough up the money. The temporary boost buffs are fine (more xp, more money, whatever it was they've got) and usually good sellers in a F2P model. The limit on flashpoints is reasonable, as is purchasing extra trips. The rest XP for subscribers only seems a little petty, but only a little bit (and that only because rest XP is a big boost to mitigating that alts are going to have to run a lot of the same planetary quest content just to keep up with their stories' level).
Hide headslot's actually kind of strange. Selling aesthetic/appearance customization options is usually nice. However, it feels off here because they're asking me to pay to avoid their ugly equipment, not get something shiny and special.

Especially since most of the head slot options for my Miraluka JK *alter* her blindfold to one I *did not choose* at character creation. (She uses the big faceplate that covers her from nose to forehead. With her current, and the three other headslots I had in her inventory, item it gives her the little Morpheus sunglasses that look stupid). I've played my Bounty Hunter helmetless her entire career, and now she's stuck with an atrocious flared helmet.
And then, finally, there's the quickbar problem. My knight isn't even a Sentinel, and she's literally filled her two quickbars at level 24. I'm pretty sure my Shadow will be unplayable. Giving me something unplayable for free isn't doing anybody any favors. It makes them look bad, and it turns me off from wanting to try to see if the game's improved.