+1 for the Koso Apollo grips
I notice that Oxford has introduced a Pro line which integrates the temperature control into the left grip the same way the Koso grips work.
Oxford Products Ltd (OXFORD) - a global leader in motorcycle and bicycle products. Established in 1973, OXFORD is now one of the world's leading suppliers of products to the two-wheeled industry.
www.oxfordproducts.com
One possible advantage of the Oxfords is they sell each grip individually, so in the event of a failure or crash damage, you can replace just he damaged grip without buying a whole new set.
Unfortunately, their cost is significantly greater than the Koso at £199 ($250 USD) on their website vs. $130 USD for the Koso on Amazon US.
Then again, Amazon is now awash with cheap heated grips with integrated grip/controller in the neighborhood of $30 USD or less. Maybe dip your toe in the heated grip waters for cheap and see how it goes?
I wired my Koso grips into the OEM wiring harness of my 1300 using the quartet harness and some compatible connectors. Super clean and sanitary.