+1 on what Mike said. You have to decide whether the trade-off is worth it. My last bike was a 2010 ANSS Vision which was lower thanthe regular Visiondue to the 8-Ball shock theyused that year. 3/4s of the miles I put on were circuitous mountain roads and there seemed to be almost no limit as to how deep you could make it dive. It was one of the things I loved most about that bike.
I now have a 2009 ANSS Vision and it's a good 1/2 to 1 inch lower than the the last. I've definitely had to adapt to the new heightby beingslightly less aggressive in the technical stuff, but the bike still gobbles up the crooked blacktop. On the plus side, I like thelower look and feel of the bike. It's difficult to say for sure, because my last Vision was so agile, but Ibelieve thisone might be ever so slightly more nimble when it comes to ultra-slowmaneuverability.
If you do decide to lower your bike, I would suggest buying a bash plate from HMD or the Doc. It will be well worth the money.