Is there anywhere I can go (other than this forum) to find out what the differences are between the M6 through M8 HQ model kites are? Does anyone know what changes they made over the past few years on these kites? I am looking at getting one and just want to make sure I am not getting a "lemon year" because one of the newer models included something I wish I had.

I'd suggest contacting chris here. He can give you details about the Montanas from a viewpoint we can't match. I don't think there's a lemon year.

There are a lot of folks here that fly them and I don't recall hearing anything bad outside of normal wear and the occasional pilot induced damage.

No lemons in those models based on forum comments about flight characteristics. I can't recall any comments on mechanical glitched either. If you can see it before you buy it , check for line wear at any points a line passes over/thru pulleys or rings. Love my M7 and plan to aquire the whole series.

I've had Montanas since the III. From the M6 forward, I considered all of them perfect kites, yet each one found a way to be better than the one before. Buy as new as you can with confidence. You can search for my comments over the years to see the details if you like.