Nemesis Ultra wheel lock

I've just spotted the full page advert for the Purpleline Nemesis Ultra wheel lock in the latest Club magazine.  Has anybody had any experience of using this device?  Currently I'm using a wheel lock that fits an Alko chassis receiver and more often than not when I think I'm pitched or parked I find one of the alloy wheel spokes is in the way of the receiver.  I'm about to change my 'van to one with a BPW chassis before I spend £300 on a similar chassis reciever wheel lock I'm wondering if anyone can comment on the advert / product as it would seem to overcome the out of line receiver problem. 

TIA Peter