There's a thread here about them, think the general concensus was they were a waste of time. (Think it was Jennas thread but not sure)
I have to say that I would be lost without mine. Its a lascal one. I had a litaf one but it never seem very sturdy so I got the lascal one and Jess loves it. It gives me a great deal more freedom.
Depends on the child and how old they are. We got one and DD likes to jump off and run away but she was only just over 2 when we got it. Tried again last week and she is better. I think once she is a little older it will work really well, but my double buggy is easier for me now even though its bigger! suggest you get a second hand one and then if it doesn't work out sell it.
weve got the bugaboo one ready for when baby arrives so hoping it works out ok for us. alana does tend to run away so im dreading it
Brody will run away! My pram has a built in buggy board so I'll know if he'll stay put or not for when I get a new buggy later. We will have a double buggy though so I dunno