My experience is limited wrt the 1150GSA. A friend let me ride his around the block and from that day I wanted a GSA. Fast forward 8 years and I bought a 1200GSA 09 model in red at a dealer with 3800mls on it. If at the time there was a 1150GSA LE with low miles for sale I would have had it. So far only good memories with the bike and it has taken me and the missus on our holidays. It is annoying that the fuel strip is not a float and because of the ABS it has to go to BMW for the ABS bleed test, the closed throttle fuelling was sorted with an accelerator module. Now that it is out of warranty I service it myself to keep costs down. I have modify it to suit my needs and that is what I like about BMW GS's. You can make it the bike you want. Basically it boils down to this for me. The bike needs to be reliable and something that you'll want to ride. There must be a fun factor involved otherwise you can just as well buy a 50cc moped and because the history of the bike is known to me and I keep in tip top condition, I've developed a liking for it. The GS handles well and will cruise at 80/90 all day with a massive tank range. I intend to keep this bike for some time as it suits me very well. I've got a 55reg R1100S and that has turned into a bit of a garage queen but a lovely bike none the less. It doesn't matter which one you choose. If the bike has been abused mechanically and some bodges with the electrics you can expect trouble and it'll turn into a money pit. The best bike is the one that is payed for and you can enjoy.
PS. I'm a new GS owner and have not grown up so to speak with the 1100 and then the 1150 so have nothing to compare it with but after any test ride of another bike I get back on the 1200GSA and it feels like home. BTW the R900RR uses a modified 1150 engine.
PS. I'm a new GS owner and have not grown up so to speak with the 1100 and then the 1150 so have nothing to compare it with but after any test ride of another bike I get back on the 1200GSA and it feels like home. BTW the R900RR uses a modified 1150 engine.

Just a bit slow on the straight but you reel them in on the corners and that is a satisfying feeling.
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next thing we know is that you'll be announcing the icon status of this trusty old workhorse of a bike. But hold on a mo I think you've already done that ad nauseum. 