I'm a total newb to diving and looking to get some equipment. At the dive shop today they recommended the SP Knighthawk. Seemed nice to me. I liked the Air2 feature, but reading here a lot do not like it. Being a newb, I'd like to find out why but aftering searching a bit, I can only find where people are saying "let's not go there" or "I am not going to comment" about the Air2. Is there somewhere this was discussed that I could read to see both sides? Thanks.