Tara's class is amazing! She offers clear instruction about the Hypnobirthing approach to childbirth and a lot of additional information, experience, and advice (if you want it) beyond the Hypnobirthing material too. She's passionate about the material and great about pacing and taking questions. Take the class early as she has lots of good things to think about in hospital/midwife tours and things to speak to your doctor about - especially for first time parents. Very unbiased info and you can make your own decisions!
As to Hypnobirthing overall - a friend of ours recommended the method. We tend to be pretty skeptical but found the material makes a lot of sense and feels well-grounded. We're fortunate that our doctor was already aware and on-board with the concepts presented in the class and told us it was one of her favorite methods. 'Meditative Birthing' would be more accurate but maybe not as catchy...
The only thing I'd like (and really there's just not enough time even with 5 weeks of classes) is more in-class practice/repeats of exercises. She goes through everything once but it's very much on you to practice at home. Also - check your insurance, they may cover the course fees (as birthing preparation classes).