I've had an awesome time every time I have been here. This is usually because it's a home visit and I'm hanging out with a friend that loves to have a good time, but don't let that take away from Zephyr.
The place is awesome because it has 3 levels, indoor and outdoor. There are two bars, levels 1 and 3: the 1st floor is more like a sit down and relax bar, the 3rd floor is get your drink and socialize, maybe even dance. The drinks can be pricey if you don't know your way around, but there are always decent specials and unless you are spoiled and picky, you can adapt to these offerings after a few rounds.
You can get lots of different vibes going around this bar, so it's easy to find a crowd you like and stick with that one. That's why I like this place so much.