I have the adventure buggy with the toddler seat.
Fitting it in the car is a pain cause I have to remove the toddler seat put it all in the boot then when I get it out reattach it and at first it was quite fiddly to get off, easy to get on tho. (once you know how). The inside of the pram comes with 2 parts, the newborn part is flat so you can't elevate them and then when they get to wanting to sit up a little you have to chnage the whole inside bit which means that once they are in the elevated part you can't lie them flat. I hope that makes sense. But DD2 still manages to sleep in it.

Its great because its easy to manouvere around and DD1 loves sitting up where she does, much happier being in the pram when she can see so well from the toddler seat. Plus now DD2 has just been siitng up in the pram rather than the flat position she can look around without having another seat blocking her way like alot of those toddler seats do. If you go shopping its easier to get into shops than a side by side. I bought mine 2nd hand off e-bay.