Hey Tefal. I love my k1300s. I'm at 46,000 miles now, bought about 3 years ago at 14k ish. It has huge power and accesses a bunch of is pretty low down. I can do my a road commute in 2nd gear or 6th gear and progress well enough!
For me it's comfortable up to about three hours. After that and/or a long day I start to get a bit uncomfortable. I'm 5'8 so maybe I have to reach a bit more than some.
I get about 170 miles doing the weekly commute which is about 17 miles each way. It lives outside and gets serviced and cleaned by BMW. I'm on the insured warranty and it's covered most stuff. Unfortunately the rear shock and suspension stuff is out of cover after 30,000 miles
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Oh, I don't have the electronic suspension, but given the cost to refurb that and various people never knowing if they can tell the difference, I'm ok with it. I have TCS and ABS which for me were the must haves with 175bhp and not being able to predict the future.
I'm attached enough to it - oh, the sports panniers are decent enough for me, fit a lid or a week of stuff for a Europe trip - that right now I'd only replace it with a newer one. I keep waiting though to see if they do a real update. And I don't want to realise the depreciation just yet hehe.