I originally had the 300R in mind when I bought, went with CIH and found out they had a recall on them. Impatient me couldn't wait for the bike and liked the price drop for the 300f. Aesthetically I like the R more, and I am a sucker for blue, but I know that stuff doesn't matter that much and it was hard to justify the extra 2900. I really don't think performance would be that much better for me with the R, and the F is light enough and perfect for Chicago commutes.
One day while I was riding I saw a 300R coming my way and I got excited to see one on the road. It looked like the guy was riding a roller skate, it was so disproportionate for him. He had to be tall, cause it was very odd looking. I'm only 5'6" and I feel like both bikes suit me well. I feel like it would be pretty comfortable for people with long limbs