I´ve recently discovered these strings for me. I was in the middle of recording process and I needed some fresh strings. I found one set at home and bought a couple of them at a local guitar store. Normally I used to play on Rotosound MA11 sig. set. So I will be comparing them a little.
I play an Ibanez RG2020x tunned in drop c. Over the years I figured out the perfect set for me - it was Rotosound MA11 (11-59), but I ran out of them and needed some fresh strings quickly, so I picked up the daddarios. Although the sixth string is a .56 gauge, the tension is quite nice and the strings feel nice. The quality is nice as well and I can play them for about 1-2 weeks, depending on the playing time. The sound is pretty bright and tight, provoking me to play djent and ola-style chugga-chugga all the time haha :D But to be honest the .59 rotosound string sounds more beefier. Generally the rotos sound a bit brighter and nastier then the daddarios. You should concider this when choosing the strings for your particular guitar. Also the .11 roto string has a little more tension then the daddario one, dunno why lol. The Daddarios are kinda easier to bend as well.
All in all, the daddarios exl117 are pretty good strings for standard D/Drop C tuning. I would suggest you to try the Rotos MA11 though.