Britax First Class, Where to buy and whats the difference?

[jennieflower]

I'm about to buy new car seat for my 8 month old son as he's outgrown his Maxi Cosi Cabrio. We're looking at the Britax first class so he can rear face for longer but there seem to be quite a few different models

First Class SI
First Class Plus
First Class SI Ultra

So what's the difference? My heads spinning!

Anyone?

No idea about the differences I'm afraid but we've just bought the First Class Plus and it is very nice.

Only thing I don't like are the chest/shoulder pads which get in the way a bit but I imagine they'll be fine when DD is older (she is 7mo).

We got ours from Kiddicare.

I have the SI it stands for side impact. bloody good car seat...Ultra has covers which you can remove whilst car seat is still fixed...with normal one you have to remove seat.

Plus one has a audiable sound when belt tighted...not essential. I just pulled as tight as I can and see if I can get a finger under...if not then its tight enough.

No idea, we have Si ultra I think and it is a very nice seat. My DD is still facing backwards at 14m so I am pleased with it.