If you can stand the wait for carriage pop across to the UKGSers Forum and look up Denz0. The guy is an absolute genius and will rebuid your unit, including customising to you weight etc. He rebuilt a friends GSA unit, including the appropriate weight spring for him  for well less then £400. He is based in Croydon Uk though, so thats half a world away. Still looks a cheaper option thaan new though.

I'm using a Shoei GT Air. I don't think it's the quietest helmet out there.
But on another note. Went to my local BMW dealer to demo the r1250rs and the gs. What a torquey beasts in comparison. Wind protection and noise for me not as good as expected for motorcycles a tier above the 900XR.
A good thing that I tested these bikes, now I'm a little bit less frustrated about my windscreen.

I did this service on my F900R last weekend.  At 3 years, 11,700 miles, the fork oil was in surprisingly good condition. In hindsight I would have left it for another year/6,000 miles, especially considering that 2 liters of Type 4 fork oil from the dealer cost me over $87.  I only did a "dump and run", not a full disassembly of the forks.  With that method, I was able to get 475mL (~85% of dry capacity) of fluid from the right leg, which includes the damping cartridge, and 580mL (~92% of dry capacity) from the left leg.

Before opening the fork cap, I turned the fork upside down, shook up the fluid, and pumped the mechanism to try to suspend any grit that had settled into the bottom of the fork back into the fluid.  This seemed to work as the fluid was a uniform color throughout the draining process, there was no metallic sludge at the end of the pour like what is shown in Dave Moss' Dump & Run video and most others on Youtube.

 If you're draining the fluid without disassembling, make sure you have both the opening of the fork tube and the holes in the damper unit over your collection container, as oil will pour out of both at the same time when you invert it. If you spill some, you can use a small kitchen scale (~$10 on Amazon) to weigh a couple of dry paper towels, clean up the spilled oil with them, then weigh them again.  Then use the scale to add that same weight worth of fresh oil to the amount that made it into your measuring container.

I will send a sample of the used fork oil and a sample of the fresh Type 4 fluid to Blackstone Laboratories for analysis. Once we have the cSt@40°C and the VI for fresh BMW oil, it will be easier to compare with 3rd party products and switch to something else.