Ziggy -- go back and check out the spektrum catalog that was posted in this thread. The HRS stuff has 2ms response and the Pro stuff has 3ms response. The way the catalog text reads it sounds like to get 2ms response they had to make the link incompatible with the Pro stuff.
I'm not nearly a good enough racer to tell the difference between 2ms and 3ms, so I'm going to go Pro
Still, any Spektrum is better than no spektrum... anyone want to buy some KO crystals?
Tz