HTT has largely redone their menu as of last month (I believe) -- there is now a "classic" menu and a "vegan" one. An entire vegan menu at a non-vegetarian restaurant?! I've only seen that one other time, and was similarly chuffed.
Never had the mac n cheeze that others rave or don't rave about -- I usually stick to the scrambles (not tofu-heavy, and not steeped in turmeric -- I am generally quite suspicious of vegan scrambles, but I love theirs). When they're good, they're insanely awesome (out-of-town friends talk longingly of them), and when they're off, they're still pretty solid. A side of tots and vegan gravy is awesome snacking/sharing food, and I've had good luck with portobello sandwiches from the old-menu days. The service is reliable, knowledgeable, and generally quite friendly (or at least attentively aloof).
Plus they make their own freaking vegan corn dogs. Which are served on a bed of tater tots. Health food this is not, but delicious it is for sure.
Smoking note: if you're in the bar, you may well get steeped in it, but if you stick to the restaurant side you'll either mostly or entirely avoid it.