I've been using my 2011 base model Mini with my U2412M, connected with a DisplayPort to MiniDisplayPort cable for six days now and in that time I've yet to notice any issues, and certainly not those mentioned in the thread with the U2210 🙂
One thing to keep in mind is it (sadly) has a lack of aspect ratio control or pixel mapping so while its not an issue with OS X/Windows or even a 360 which allows certain 16:10 resolutions to be selected but if you attach anything thats 16:9 only like a PS3 or Blu Ray player it will stretch the output 🙁 not an issue for me as I only use it with my Mac(s) but worth keeping in mind.
I realise its not the same model Mini but since you have no other replies you may find this somewhat helpful