R&A does a really good job with the fit, I wouldn't worry about that. They have enough inventory to make sure you get something that does. When I went for my bike they had one in the next size up from their size estimate, one that I thought should fit, and they convinced me otherwise, and they were right.

I guess it could depend on the amount being spent. I spent a lot. If you are buying a $500 bike they may not spend as much time. It helps to go when they aren't busy.

Ultimately, the bike I bought fit perfectly and I could ride it all day without fatigue.

And Sheepshead Cycles is another good place to go. I go to both R&A and Sheepshead. I also go to Sids on 34th a lot (near my office), and Toga on the way back from the GWB.