Do I really need one YES
You ask why? I ask Why not?
The OP has already identified that he wants one, he just wanted to know other brands.
1. I always carry at least 2 spares when we go bush. That is minimum.
2. Mounting big heavy wheels on rear doors wrecks the hinges
3. Having an under-slung tyre reduces clearance for my cruza whilst 4x4ing
4. Having an under-slung tyre is a real PITA to remove if you have a flat rear tyre.
5. The winch on an under-slung tyre can become damaged or full of rocks and dirt. This happened to me quite a few years ago on a 47S Cruza and was a major PITA to get the spare down.
6. The steel rear bar gigs both the Cruza and family much better protection than the OM plastic version
7. I don't like spares on roofracks.
I have had the swing away rear on my last 2 vehicles over the last 14 years. In 4-5 years I will replace the 100S with most likely a 76S. One of the first mods will be a rear swing bar rear carrier. I am sure as my wife and I get older in the future, (we are mid 40s at the moment) our 4x4 travels will be less remote, for less time and probably wont even need a 4B at all.
At the moment we travel remotely and need a decent 4x4 with clearance and capability and at least 2 spares.
What we do may differ to you Lost but I am a big fan of them. I am just expressing my opinion.
Cheers mate. Muz.