Does anyone know anything about the new "B" series that John Deere offers. I know that it is a lower quality commercial mower, probably comparable to their old Z700 series. I am looking at buying one but I would like to know more about them. I know that nobody has experience with them because this is the first year they are offered but has anyone heard anything about them? I have a budget of around $7,000 and I was going to buy a used Z920 or something similiar but when I figured out that the Z915B was in that price range, I thought I would just buy one of them simply because of the warrany and dealer support. I am just a little bit skeptical because they are so light duty, even though they are commercial mowers. Any suggestions?