My kid has an '07 883 Custom, and the first thing to go was the stock seat. We put a Sundowner on it and now she can ride all day with us.
As mentioned- power is relative. The 883 will accelerate faster than most cages, which is really all you need. It won't run with a V65 Magna, Vrod, or just about anything else that's big & has a "V" in its name, but this is a Harley- not a VMax.
But- like most mid-size bikes it has more than enough power to get you killed if you forget to respect it.
It is an air-cooled engine, so it will run warm. But having owned a water-cooled 900cc Vulcan awhile back, IMO there isn't a tremendous amount of difference in felt heat between the two on a hot, muggy summer day. In truth, I've owned a lot of different bikes over the years and I don't recall any of them being overly comfortable on a hot summer day. After all- regardless of how it sheds its heat, with a one to two liter heat pump doing its thing 3" below your nads you'll
always feel
some heat...
Put a comfy seat, a windshield, and a set of saddle bags on it and you've got a nice cruiser that can handle any day-ride you want to take and it won't break the bank. I'd recommend the Custom- that'll get you forward controls and a 4.5 gal fuel tank- which is worth its weight in gold...
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