Have a 15’ Deere batwing. Love it. I’ll run it in epto when it’s not real heavy. Saves a ton of fuel and plenty of power. I would get the 15 over the 12 for the reasons you listed. Really speeds things up. I just cut 23 acres the other day with several trees to go around in 3 hrs. Not bad in my book
Brett
More good information.
My 9960 does not make a great deal of torque at 1,600 RPM. The PTO engagement is electric over hydraulic. I like to engage the PTO at idle but doing so if in EPTO with the 7' cutter engaged will sometimes stall the engine unless I blip the foot throttle when doing so.
Moreover, sometimes I find myself in conditions (even flat ground, cutting annual weeds) where I have insufficient torque in EPTO high range 1st gear even if cheating and operating the engine above EPTO 540 PTO RPM (maybe 600 PTO RPM or so). This forces me to stop, change to low range, stop the mower, dismount and change to non EPTO, and mow in low range 6th gear, which is slower than I would like for the conditions. Of course, the power shifting HDC24 transmission would likely solve this dilemma but such is not available on ROPS models.
What is the PTO HP and displacement of your 5100E?
SDT