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I had a 690 loaner when I took my 390 to be serviced. It might have been limited/detuned or whatever due to being a loaner but I was proper underwhelmed. I thought I'd be gutted to hand it back and take my 390 away but nah.
You don't have to work the gearbox like you do on the 390 but then, that's half the fun innit and only managed to get an extra 15 or 20mph out of the top end of it ragging it back along the a9 to get it back in time.
I’ll get one if you get one.
I reckon the smaller engine might even make it more fun round town. Though I fear above 60mph you’d miss it.