I agree Toad. The B seems to be more like the vicious Kitty at low speed. I find it much more prone to a naaaaaasty snap stall than the D. Maybe that's just me though.. I haven't flown the D model in a while, and my Jug is so gentle and controlable at low speed in comparison.
But Rip, by all means fly it like the D. It is very similar in most respects. It isn't quite as fast down low, but it is faster up high. If you are doing a high alt escort, the B is a great choice.
Just be careful how you handle her at low speed. 51B can get the job done, but she takes a gentle hand on the stick. Slap her around too much and she'll bite you. Stroke her gently and she'll repay you with kills.

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Sean "Lephturn" Conrad - Aces High Chief Trainer
A proud member of the mighty Flying Pigs
http://www.flyingpigs.comCheck out
Lephturn's Aerodrome for AH articles and training info!