Weehoo I-go Trailer

Anyone used or has seen one of those Weehoo I-go child trailer?

Or perhaps knows something similar? My 4yo isn't ready for one of those detachable bikey things and I wan't her to join in with the pedaling.

I'm thinking about ditching a regular double trailer in favour of single one, so I can do more touring/trail.

http://www.weehoo.co.uk/
http://www.family-cycles.co.uk/weehoo-i-go-bicycle-child-trailer-717-p.asp

Looks nice… but pricey. I've given up on the idea of tagalongs now, unless hiring stuff in situ. Hopefully by the time Tynan's 6 or so, he'll be competent enough for us to get to a local train station, and then from the train station at the other end to some traffic-free routes. In the meantime, if me and him need to get somewhere, it's the bus or the train, and my Brompton if I'm dropping him off and travelling back alone.

Hiring.
I forgot about it. I know that in the US those are for hire from the dealers.
Do you know about any place here?

My daughter struggles with cycling, because she's much taller than kids her age. That was the reason I couldn't get Rohan from you and why she can't ride her little shit Barbie bike with stabilisers. Her legs aren't that long (47cm inseam), but a lot for someone who isn't four yet. With a single speed she often finds herself pedalling backwards - especially uphill - which is frustrating for her. I should take her to Scheritt.

@EEI - Did you ever try out the Weehoo trailer?