Thanks girls for all of your expert help & info!

We've decided to go with the S&S Unity - mainly because of the weight limit to 12kgs & we'd like to keep bub in it for as long as possible.

We had one of the older style capsules for Luke - and while it was great, it was always awkward for me to carry being a little bulky & me being so short, my poor short arms couldn't carry it too comfortably
It just used to bang into the side of my legs all of the time

In other news with the seat (That MIL bought) - I have no idea where FIL got his onfo from in regards to how much she spent & the fact that she bought it online... DH ended up calling her & asking & she was at work at the time & couldn't remember the brand... but it was one she got on sale at Target... so definately not the Meridian.

Have no clue what to do now - DH & I had our minds made up on the meridian (and then later to get a maxi rider as we're praying we're lucky enough to have another IVF bub after this one).
She was going to call us back that night when she got home from work to tell us which one it was, but that was Monday & we still haven't heard from her

I don't want to come across petty & ungrateful (especially after the year we've had with her, it would be nice to be the bigger person & accept it & move on) - but I just want the seat I want ... and we never expected anyone to buy us anything.
So not sure what we'll do there - maybe use the one she gives us as a second one in DH's car... it will depend on its safety etc.
What a mess.... and I just feel guilty about it

Anyway, that became a big vent & totally off topic, so sorry!!!