I've been to Juan Jaime's several times - both for lunch and happy hour. I like the atmosphere here - it's relaxed, has an upscale feel to it and they play good music. Later in the evening it can get fairly busy here and the noise level definitely increases. Of course, the tequila probably contributes towards that...
The food is good - nothing super fancy, but quick and simple. At lunch I usually go for the Tacos Trio (chicken), but I've also had their burritos and they are also good . They have a great salsa bar with a lot of options. The chips are okay - like someone else on here mentioned they can be greasy at times. I would say I come here more for the happy hour than I actually do for dinner.
The bartenders stay on top of everyone and they have a very nice selection of tequilas. Happy hour prices are competitive and the crowd that hangs out here is pretty social.
The service here is excellent - never had a bad experience. I have to give a shout-out to Kaitlyn who took good care of us today during lunch. If every place had a server like her, life would be good.
Definitely worth a visit - especially if you are looking to decompress after a long day or want to meet up with friends for a drink or two at the end of the day.