I know you saw one C-hing offer a 2nd hand V1 S II.
As I said, FW05 is entry level. V1 RRR / SR series is championship level.
You can said FW05 = tt01e; V1 SIII = TA05R; V1 RRR /SR = TRF 416
Think what you need & go what you should buy. There have no standard. For me, V1 SIII is good enough for me, cos I willnot join the championship.