Suspension - Replacement rear Shocks

[CD]

I've recently bought a 900 with the standard fitment rusty swing arm. When I take it off for greasing the linkage and plastic coating etc, I might replace the rear shock.
The handling feels ok so I think the one on the bike is alright, but what's the lowdown on these?
cgi.ebay.co.uk/Yamaha-XJ900-XJ-900-Diversion-Shock-absorber_W0QQitemZ320082507966QQihZ011QQcategoryZ10490QQrdZ1QQcmdZViewItem

[teffort]

Dave
Someone posted about the shock that DK sell through e-bay on the old site and mentioned that it's made by Betor I think. Probably no worse than the original Yamaha shock but not as good as a Hagon. The Hagon is a lot more expensive though at around £245 from M&P. The Betor only has a preload adjustment like the original.
Paul

[CD]

Hi Teff,
I'll have to see how I go with the original when I know the suspension linkage isn't masking any problems. But I have my doubts, the preload is siezed up. The adjusting ring appears to be free, but the sliding part is siezed solid.
I dont expect it to handle like an R1 or even an R reg CBR600 so the Betor might well be ok for me.