I for one have had nothing but positive experiences with mintpal, as far as I know they've only gone down once and that was during that crazy 10,000 BTC BC rush.

Good for them if they're doing very well, they provided a much needed polished exchange to what was a pretty crappy prior selection. 

My only complaint is that I miss the old graph style (though I can understand the new one give a better sense of volume and actual price movement).