I've got a pair of LDs, ok shoe, seems to be a bit of a Mizuno clone, and I use as a training pair. Seems to be a harder feel than my usual wave riders, which I use for long races/marathons so I don't think I'll be buying any more atm, but will keep an eye on them, they may get better as new version are brought out.
Tbh I hardly ever take a phone running, but on long trail runs etc. where you might need one in an emergency, I have a little PAYG samsung clamshell, cost less than a tenner and slips into virtually any shorts pocket.
I would say its just for outgoing calls, so no interruptions on my runs, but it is actually my only phone (technophobe alert), but I still never get any calls!