If someone told you that bigger string gauges sound better or stay in tune better they are full of it. That is a myth. Bigger strings make most 7 strings sound muddy and you lose note definition. I have these on my Dean RC7x with a 25.5" scale length, I have it tuned to B Standard for 7 String (B E A D G B E), just like a 6 string with 09 to 42 strings, and an extra 54 for the Low B.
I play almost every day for at least a half hour to an hour. Only gotta tune up about once a week. These strings stay in tune well, are very crisp, and if you clean them (which you should with any string) they should last about a month. Better and more affordable than most of its competitors