For the age/mileage bikes they have listed for sale I'd never consider anything but a private sale. I don't think the extra you pay a dealer is worth it.

Also from their eBay store I'm scared

GSXR 750Y asking absolute top dollar (I paid less private for a pristine 1000 K1) https://www.ebay.co.uk/itm/2000-W-SU...cAAOSwvx5bUm8V

Mot History says there is a drop of 6000 miles on the clocks between last 2 MOT's (rider must have reversed for 6k miles). It has spent 9 years without an MOT (so I'd guess track bike). From the amount of non standard tat (those extras are cheap eBay stuff), paint and fairings I'd also assume its been thrown down the tarmac more than a truck stop hooker.

I didn't go hunting through everything they sell to find that, looked them up on eBay and it was the first bike I clicked on. Based on that bike alone I'd never go anywhere near them.