Sign up for IVF Study?

Following my lap, my doctor has recommended I go straight to IVF. She is encouraging me to participate in a study comparing two well-known medications (not experimental) in a population of women I fit into. Of course, the bonus is that the study costs about 1/4 of a typical IVF cycle, which makes it seem within reach for us. (We just spent all our money on the lap surgery, however, so it will still be difficult to put together funding.) Anyway, I wondered if anyone else has ever taken part in an IVF study (or any medical study, really). I have read over the study packet thoroughly and have met with the study coordinator, but I'd also like to hear a word of caution or encouragement from anyone has gone through this before.