I had a Simaudio LP5.3 for many years. I believe that was the predecessor to the 310. I only used it with MC cartridges, Benz and Lyra. I was very happy with the sound for many years. It sounded best when connected to my preamp via balanced interconnects. My system was fully balanced so it may have been a system synergy issue.
When I changed cartridges to an AMG Teatro, I could not get them to mate well, despite the plethora of settings available on the LP5.3. I ended up going with a Musical Surroundings Nova 2, now Nova 3 which despite not having balanced outputs, works really well in my system.
I have had no experience with the Whest. Good Luck!