Seems a good offer if unintentionally inflated RRP's are to be believed (!).
Speaking from a great deal of experience here (shut it Skip!) have you considered a straight forward chair with the addition of your own universal accessories?
The only reason I ask that is that I fairly recently bought an accessory chair off of ebay and whilst I'm quite happy with it the realisation has dawned on me that I'm stuffed with a load of useless accessories if the chair fails or vice versa (and they do, and I've had to modify it).
It might still be ok in that situation depending on the type of attachment or if you're handy at bodging things.
If I were you I would find a chair that you are going to be happy with and add universal accessories separately as the chances of finding something robust, comfortable and with the right accessories in the first place are fairly slim in my opinion.
Edited to add: And this is one of my big gripes...
If you enlarge that image it seems to me that the tray attachment is on the tilt under nothing more than it's own weight and barely would be good for a bag of feathers let alone a couple of filled bait tubs, coffee, phone and all the usual bits 'n bobs, add to that the fact that if the thing it's attached to, namely the chair, is anything other than bolt level it will just compound the problem.
I just think that accessory chairs are a good idea in principle but practically all but useless in practice, I bought a separate, cheap bivvy table with extendable legs to get around that problem even though I use it for bait tubs, cups of tea etc.
