I've been running their starter for 3+ years on an I-4 (first with a Tiico, now an AVH 2L) without a problem. Easy install, low amp draw, and seems to work at anything above 11VDC. Pricey, yeah, but after several dead rebuilts in a near or so, seemed like a decent deal, and at the time, cheaper than an adapter and TDI starter (with no suitable core).  YMMV

Keith Hughes
'86 Westy GenV (Marvin)
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 Date:    Sat, 21 Jan 2017 10:41:52 -0800
 From:    Neil N <musomuso@GMAIL.COM>
 Subject: Gowesty reduction starter user input please
 
 Hi all. My Bosch starter is on borrowed time. It spins great
 until it hits
 a flat spot. Then it may not spin at all until hit with a
 hammer. Spare
 used Bosch starter may be no better.
 
 It's my understanding that gowesty made improvements to the
 latest edition
 starter they now sell. User input in gowesty starters would
 be appreciated.
 
 Since I'm on a road trip, am considering the gowesty
 reduction gear starter
 vs the mullendore adaptor/TDI starter since it *seems* the
 former will be
 an easier install while away from home.
 
 Much thanks,
 
 Neil.