Haaha , just couldn't resist a bargain!! All common sense goes out the window when faced with a good deal eh? 
Well it looks a very nice tent, not much info on google that I could see though Sunncamp are a good make.i have a sunncamp eden 800 and its my favourite tent, very good quality. Previous years models never have much info available.
I would never say that with 3 kids you don't need much room, far from it the bigger the better imo.
Saying that, I've never had a small tent except a 2man dome we put up for the kids to play in. .
You'll have to have a practise run though, I reckon the inner first ones are more difficult to put up. I go for a tunnel shape every time myself, because I know i can do them on my own if I have to.
Since my 20 yr old son has been dropping me off (this year)he's become quite an expert at putting the tent up, he never had to do anything much when he was younger, being the youngest at the time, me and DH did the tent, and he's not bothered camping much in his teens. He could do it single handed now though.
My 9 year old son is pretty useless at helping tbh, he can't even be trusted to hand pegs when needed, he's always off on his bike as soon as we arrive.
Your girl is gonna be trained young, thats the best way, she'll know you really need her help, whereas my boy knows he's not really needed. She'll grow up like you, not afraid of a challenge. and a competent tenter.
Go for it, and I hope it's a great tent for you.
------------- Debbie
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