I had an '09 1100 (non S) and never messed with the suspension; I wanted to, but just never got around to it.. I traded it in this summer for a '12 1100evo and as part of the purchase, I bit the bullet and bought the Ohlins rear (DU-737) shock with it. They had to re-spring it for my weight, which was included with the purchase price. I had the rear installed at my 600 mile service, and then proceeded to put 7500 miles on it over the next 36 days. Was it worth it? HELL YA! the difference was insane.
At the same time, I was still running the stock fork crap (Im sorry, but the stock forks simply suck). As part of the purchase price, I paid an estimated amount to buy an Ohlins cartridge kit for the bike, plus labor (we over estimated the price just in case). I knew I wouldnt get it in time for the trip, but upon further investigation, we (dealership and I) found out that Ohlins does not, nor do they have any plans to make a cartridge kit for the 1100evo. As a result, we switched and contacted RaceTech, who was willing to do it, but needed my forks to do the R&D on the cartridge kit. Well, I got back at the begining of Sept, and while the bike was getting the 7500 mile service, I had them send the forks out to Racetech; I got the call today, my forks arrived back at the dealer. Cant speak to how they will feel yet, but if its anything like the rear was, it should be impressive.
While I was on my trip, I went to both Laguna and Indy GP's. I got the opportunity to talk to the Ohlins rep at Laguna in length. Ironically, he was the one my dealer had spoken to, so he was well aware of my situation. He explained their situation, and why there wouldn't be a cartridge kit for the 1100evo. He was very nice about it, and even suggested contacting Racetech (which I explained we did, and they were going to handle it).
I also got to talk to Lee Parks regarding a friends 1198s, and the Ohlins that come with it. My friend wanted to know the best "bang for the buck" regarding his suspension. I was told that, yes those kits that come on the bikes are built to a price point. The externals are top notch, but you would gain some improvements by upgrading the internals. He suggested re-springing to correct weight, re-valve, and use the appropriate oil. It would take a good setup and make it great (in his opinion).
I got lots of info this summer (plus rode lots of miles!) and hope my long winded answer helps a little. Upgrading will help you. You might be better off just finding a decent cartridge kit for your forks, and spend the $$ to get the Ohilns rear since its easily available. Its worth the $$ if you can swing it!
P.S. I had a Hypermotard, and the front forks totally sucked. I spent the $$ and upgraded to the GP Suspension cartridge kits. It was well worth it, which is why when I got my 1100evo, I didnt think twice, skipped the normal upgrades, and spent my $$ on suspension
