I owned a K70 with the new speed switches. They're weird. If you've used a membrane keyboard for most of your life, then transitioning immediately into one of the most sensitive keyboard switches on the market is very jarring. I'm used to bottoming out keys the instance a note is supposed to be triggered, but with speed and a smaller extent, red switches, you actuate LONG before you actually bottom out, and so if you're relying on bottoming out to hit notes on time, your accuracy will suffer tremendously as it did with me.
On the other hand, if you can get used to hitting notes the second your finger applies even the most minute pressure on the keys, then the faster/more sensitive switches are pretty advantageous, especially for streams.
