More riders spend $1500 on suspension parts based on internet tips then bother to do a careful setup of the stock suspension. On bikes like the S10, the stock suspension is actually pretty good - not the best, but pretty good and for most, probably adequate, especially with the right spring for their weight. The sad thing is that because of the generally wider range of aftermarket suspension parts adjustment, setup becomes even MORE critical than stock. I've been on lots of sportbikes with Ohins that are setup so far out of whack, the bikes are almost unrideable.
Do a good setup on the stock stuff and if you're at the limits of adjustability (e.g., can't get proper sag without excessive preload, bottoming/topping, insufficient rebound, etc.) or notice some other deficiency, then consider an upgrade. If you don't know how to do a good setup then do some reading and spend some quality time on a well-known section of bumpy road with a notebook and learn. Or find someone who can show you proper setup.
FWIIW, I've had three bikes with Ohlins and two with Penske's and overall, I thought the Penske stuff was better. I've also had some quirky experiences with the Ohlins USA shop in NC. So I'm no longer a big Ohlins fan although some of their stuff is undeniably good. I just think they've been on top so long, they're a little arrogant.
- Mark