Want more productivity for next season, but I'm more comfortable standing than sitting (no ztr). Have a 52" Bunton Hydro, 18 hp, with a Proslide. With larger tires, I top out at about 5 mph. Has anyone gone from a WB/sulky to a Stander or Surfer? Much of a gain? Pros and cons of standing riders? (I suppose my mowing speed would increase some, but would an outlay of $6000 or so re-pay itself?