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I've had Oxford, Koso, OEM Ducati, OEM Honda, and now OEM Moto Guzzi grips on various bikes.
The only one I had serious quality issues with (so far) was the OEM Honda ones, which vary based on the bike, but it was the generic-type ones they repackage for a few bikes. The button failed and the grips didn't get hot enough. The others get hot enough with me accepting that at a point you just need hand guards, Hippo Hands, or insulated gloves to be comfortable. My Oxford Heaterz have probably seen the most use and are without issue other than that the left side one regularly comes unglued, which is a pattern for all except the OEM heated grips. For the Koso ones on my V7 Stone (installed by a dealership) the left grip cable pulled out of the backside of its plug (broke) and I ended up buying a whole new kit and replacing the whole setup, properly trimming the throttle tube to my liking with a Dremel on the second install. I would recommend checking the wires to see if any pulled apart. When I install heated grips I always tried to leave slack at various points in the cable run, especially some near the steering neck of the bike so it could be fed back to the grips for their removal, unlike many of the dealer installs I've seen where all the extra cabling just gets bundled up next to the battery. At times I've noticed limited availability of both Oxfords and Koso grips. When I bought that last set of Koso grips I actually bought them on eBay because I couldn't find any online parts stores with them in stock at the time. For another bike I wanted to install the Oxford Pros, but couldn't find them in the USA soon after their release so went with Koso instead.
I think many of the reviews you'll find of the Oxfords will be of the older units with the separate control panel, it's entirely possible that the updated ones with integrated button are a different level of quality.
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