Here's my experience with the Race 1.
The Fkeys are very close to the the number row, something most are not used to, and while it sounds like a minor problem, the FN key happens to be just above the Backspace and it's very easy to clip the FN key when using backspace. This triggers a modifer, opening the calculator and steals focus. If you tend to use backspace a lot, it can really be a problem. I like my Race, but after weeks of trying to adapt, I finally had to put a shorter key cap on the FN key to stop it from happening. Also, beware, the keycaps may very well be garbage, they were on the original Race (painted over clear), I know they have made advances there, but I don't know if they are included. My legends lasted through one week of hard use (they sent me non-backlit replacements). The originals were also known to have LED problems, and they are not very stiff due to the lack of a plate (not sure if the new one has one). The cases were also painted on the original, which flaked off. Like I said, I liked the keyboad, but considering how much I paid, it wasn't worth it. Oh, and don't base your ideas of reliability on availability of parts, you don't see Race parts for sale because not many have been sold as they were/are hard to find and can cost quite a lot.
You also may want to take a look at the 68key Magicforce keyboards. So far, I'm liking it more than my 75% and my TKL. I posted a review in the Review section. It's cheaper than 75% boards and better made than any I've seen. I could have bought 4 Magicforce for what I paid for my Race.
