It's not a standard Mk3 TSO if their description of all seats being at tables is true! It sounds a bit like a Chiltern/ex WSMR one but it'd be nice if they'd publicise that.
If it is a standard 76 seat IC70 fitted Mk3 TSO I'd not buy unless I could guarantee a table seat, ideally window. I don't fit in airlines on those. (I've had this stupid discussion with a holiday company before - basically, I can't go on your holiday unless you can guarantee you are going to select me the exit row on the flight because I won't physically fit elsewhere on some aircraft - they did do it in the end but really got quite uppity over it - plus I've had tour companies who wouldn't guarantee a twin room - I'm not going to sleep with my Dad!)
I did wonder about doing it in 1st as a Christmas present to myself, but it's sold out.