Any folks running digital wireless for guitar?

After laughing that I always seem to turn to the right when holding a guitar it occurred to me that I should take another look at wireless. The one that caught my eye initially was Line 6's Relay G-70. Although I do not have need for multiple transmitters, I liked the concept of the embedded DI functionality and ground lift. Then I happened upon a dropout thread on their forum which had a firmware fix, but showed some are still experiencing them (like 1-2 seconds every hour or so). I do not own any Line 6 gear, so figured this would be better to ask here. If moved into a live scenario, I could see this being a deal breaker (if still present).
 
I actually started off at this review site, and being unfamiliar with these, it seems digital is the way to go; but as for the system my needs are fairly simple... fidelity and continuity, but the DI/ground lift would be icing on the cake if could get the other two. The Shure GLX-D16 seems to be a serious contender "on paper," but it is better to ask folks who use these rather than get info only from marketing materials.
 
Does anyone run these regularly? Are they capable of doing tracking work, or is such an idea not feasible?

Hey Dave, thanks for the response. This particular unit would have multiple uses for me, which is why I picked up on it. I am not really sure how much "wireless" usage it would get, and seems to be its Achille's heel for some. From what I can glean from posts, it seems both the transmitter and receiver are not "overly powerful" and the receiver actually needs to be 12" off the floor to get best reception (sort of moot for usage in a pedal board). The wireless portion almost seems that normal operation is running on the ragged edge of "dead battery syndrome" which is where the cutouts occur - and for some at incredibly short range. At home I probably would not have issues, but if ever used live this could be an issue.
 
The DI and ground lift portion are really more specific to how I have things set up here now. The pedal does have an Aux in (standard instrument cable in), and can be configured to use up to three outputs. For optimal sustain, it is best to get a feedback loop from the amp, so the DI alone has great merit for me there (I currently have no DI to snag the clean signal with). The different outputs would allow me to swap between pedal board and just the amp without removing any cables (another thing I cannot readily do now). From a tracking standpoint I would most likely use it wired, but the wireless would come in handy for just playing.
 
I need to research more, since this is not overly critical at this point, but may be in the coming months (even if just the DI part).

I hear you (seems a common gripe). I am wondering if the push for "battery life" is the issue with the Line 6 Relay G70's. They claim 8+ hour battery life, and have a "sleep" function (that seems can be disabled). It is almost like they targeted the absolute minimum power to "work."
 
It also seems there is variation from unit to unit as well, but a part of that may be the power output of the guitar's pickups (I hope anyway, since that would give me an advantage). Regardless, this is definitely not a "mail order" item in my mind. If I end up getting one I would definitely want to test drive it first.