It will depend on what has been done to it by the owners...how it has been kept/stood and what Earnshaws offer by way of pre delivery checks and warranty (They've been in business for years...I bought a CBR1000 from them in c 1991)Since 2006 that CBR has passed all but there MOTs due to shocks. But it has only done a handful of miles since 2006, not more than a few hundred in a single year and many dormant years too. I don't know if that's good or bad....
Anything of that era...mid 90s to mid 00s will have been built well but you're obviously buying a 20-30 yr old bike...so buy on condition coupled with what has been done re maintenance over the years. (Look on autotrader...there are a few CBR600s that look to be in equally good condition.)
I'm probably a typical Yorkshireman....give me the option of a clean, reliable, good riding 25 yr old bike at £2k, that will be worth £2k in 5 yrs...or putting a deposit down on a new bike...pay monthlies for 5 yrs and hand it back and walk away..£5k or £6k later...for something that is a toy....I'll pick the £2k olden but golden every time...

- 10k but same amount of fun for a couple of grand = why not


