Hiya,
We didn't opt for the 4 wheeleer as we needed a 3 so got the Jane Slalom Pro and Matrix seat.
We love it. It was our only real choice and nothing else came close.
I'd say if you want a 4 wheeler and like the Jane its a good choice. Nothing came close for us in overall quality, frame, buggy, functionability (all orange buttons etc do something). The only downside for us is the Matrix is a bit heavy but as we don't plan to use it as a car seat often thats ok. I'd imagine the pushchair is lighter overall also.
With regard to the Matrix seat/lie flat pram then you really need to have it fitted into your car to see if it will fit as a sit up rear facing car seat. It does not fit a great deal of cars that way as it requires a long seatbelt. We could not use it this way and only had the lie flat option using two seatbelts which was fine as we hope to use it that way for longer trips etc. And also as a lie flat pram when LO is small and still not able to sit upright when in buggy.
Mothercare ONLY fit it as a sit up rear facing car seat. And even then the lady fitting it for us found it would not fit. Their staff are not trained to fit it as a lie flat. They also appeared to us not keen to even let us attempt to try to fit it lying flat so we had to go to an independant store who fitted it both ways and showed us how. So much for Mothercare saying the sit up Matrix was not going to fit our car
However, as we did not quite like how it ended up we decided to go with a different car seat but stick with the travel system. Cheaper than buying a new car or settling for a travel system we didn't like anywhere near as much as the Jane. We then gave them our business for the entire Jane set up as they were knowledgable and understood the Jane and its workings. It will fit pretty much all cars easily as a lie flat FWIW.
We tried the Jane Baby carrier in the car and that did not work for us as at least 50% of the babyseat has to be in contact with the car seat and it didn't quite cover enough area.
So we opted for
this Jane set up and then got a
totally different car seat from Britax (not from Mothercare tho as overpriced there) that works out about £20 more than a baby carrier but is good from birth to 4 years old.
This
site has some of the cheapest deals on Jane out there Mothercare is really expensive for Jane products.
This
site has the same product for almost £50 less than Mothercare. Shop around for Jane online and you'll find some great deals.
Hope some of that was of use
Any questions feel free to ask or drop me a PM. Hubby and I spent many hours reaearching, trying out and fitting the Jane set up we opted for.