Re: DR strings
For the record, I've not personally run in to any string breakage problems with DR's, only the inconsistent windings which lead to intonation issues and sometimes some odd warbling tones.
In favor of DR, they do offer a different feel and tone which I've not found exactly the same thing from other makers. Also, their customer service is indeed very good, and if you ever did run in to a problem they will be quick to do whatever they can to take care of it and send you replacements.
The inconsistent windings were just such a chronic problem for such a long time that if any customer insisted on using DR's, I would always recommend that they bring at least 2 or 3 sets if their guitar was coming in for a setup so that I could be more certain to be able to assemble at least one proper set with no problems. Didn't always have problems, but then again I have run in to cases where 2 or 3 sets in a row would have at least one bad string.
Now again, it's been a few years since I've given them a fair chance. When they did have inconsistent windings I would often put them under the scope to look at the problem. The patterns of inconsistency were typically so consistent along their length (things like one wide gap, one narrow, two tight wraps, one gap on the other side, then a tight wrap, then repeat) that it seemed to indicate a problem that could have been traceable to a particular machine or guide. It's quite possible, perhaps even likely that they've tracked this problem down and corrected it by now, and maybe their current strings are perfectly fine. I just don't know for sure, but am speaking of experiences over a period of several years, dating primarily back 4-5 years ago or more.
Currently I use Daddario, GHS, and Dean Markley, which between them seem to cover about any need I may have, save for some odd flat or tapewound strings for which I turn to Thomastik and LaBella. Mostly I use GHS and Markley, simply because they're made in my home state, and their quality is very good and consistent.