Harrison high top .Any good ?

We are thinking of buying a harrison high top driveaway awning for our motorhome  , its pre used as harrison no longer make this model and it has two annexes with it for what I would assume is a reasonable price of £400  ,but is it going to be worth it ? .I know the canvas ones can be cumbersome and add additional weight to our load .We currently have a very lightweight one with no annexes that we use for short trips away but my brother and his wife are due to join us for a 2 week stay and we will need more room but to be honest There are no other awnings I can find for a motorhome that enables you to add  annexes if you need to either lightweight or otherwise .!  Just not sure we should buy it for very occasional use which is all we would get out of it .Why dont they make awnings for motorhomes with annexes you can attatch when there is such a vast range for caravans .?