I have the Seatek RS-101A for 3/8" and the RF-120A that cuts 1/2" and 3/4" flex. They both have the quick clamp lever which makes them fast to use for the same size flex over and over. The big RF-170 has been on my list for a while, but I haven’t gotten around to getting one yet.
For all sizes of LFMC, I usually just use my cordless reciprosaw with a metal cutting blade. It makes a nice clean, smooth cut straight through.