MFD2 is an OEM look of course, but personally I think the RNS-510 is better
. The TID-7501 looks like the RNS-510 in terms of button layout, but it's very different once the screen is turned on.
Don't be mislead by claims like who makes the screen - these days it means very little. LG, Samsung (in a joint venture with Sony) and AIO make 96% of the LCD panels used worldwide.
EUR250 is quite a good price though. That's £210. Although I suspect the reverse camera sticks on the inside of your rear screen - doesn't matter if you are happy with that.
At the end of the day mate it's your cash - if you are OK with the interface as seen and the sound quality (which ain't brilliant - I've heard the WD6050 and it's not a patch on the RNS-510) and so on then you'll be happy with it and that's what matters. Personally I'd save for an RNS-510.