I've purchased two model from them via my FFL dealer (brother). They do charge a bit more but I do suppose that compensates for thier warranty. As long as it's a reputable manufacturer, I'll buy from whatever distributor has better pricing. I do see Davidson's as one of the better distributors for "distributor exclusives".
As far as allocations go, Each salesperson is allwed a certain number of models considered to be of limited quantity/availability. This number is based on thier sales. The more they sell, the more allocated models they're given to sell. They in turn will usually offer these models to thier better customers. The more your dealer buys from them, the better chance they'll be offered one of these allocated models.