No real help here as I don't know much at all about the Felt bikes. I have tested a Lexa, but not the SLX. The Trek store in Raleigh that I most likely will be buying my new bike from started carrying Felt last year and were still learning about them at that time. (I have a good 2 hour drive to that store so don't visit it too often.) Basically since I do not like my local LBS it's get bike in Raleigh (2 hrs away), Charlotte (5 hrs away, but our old LBS that is awesome), or my hometown in Ohio (12 hrs away, but they will sell it to me at cost, I just have to let them know ahead so they can order it and have it there when we visit my family. They are my old, old LBS, grew up riding bikes we bought from them).