W246 ??
I cannot find a W246 forum so I will ask here.
The B200 W246 has the exclusive pack which contains
"Convenience opening/closing (infrared)".
Does this relate to Keyless Go (Proximity key)?
It should also be noted that the key only has buttons to unlock and lock the vehicle and has no button to release the boot/trunk.
So the "Convenience opening" which is only available in the Exclusive pack must be special. How does it differ from the standard remote key fob function?
Convenience opening/closing opens the windows and sunroof remotely principly to ventilate a car parked in the hot sun. (Great for today, approaching 41C/106F outside.)
It also closes the windows & sunroof from the outside.

Sadly nothing to do with keyless-go.
I have keyless go on my ml and would have liked to have it on the b class but it really isn't a deal breaker for me since the b class really has a lot going for it. IMO the inconvenience of using the key for everything is minor in the bigger picture
Good luck with whatever you decide to go with
Reason: Sometimes external rf transmission can block the rf opening. In such case you can still enter unhindered by use of the ir.
"What is this cr#p" you may say?
Never have I experienced this problem with a Japanese car.
But with the Landrover Discovery, it happened regularly. My wife was not impressed when roadside assist told her to push the 2+ton car 10 feet where the interference may be different!

The ML's have Keyless Go, so I am unaware of their susceptibility to rf problems.
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