unless they have a mackie DL1608...lol
i would trust my sennheiser and shure product over line 6 anyday. not to mention the build quality. UHF is a way more stable frequency, and especially over long distances. i know fora fact i can go 200+feet before i can have any issue with delay. with the shure system it is about 50-100ish. BUT my signal is perfectly stable. no problems.
and im quite happy to say that i will never have a cordless phone, bluetooth device or a wifi signal cut me off mid gig.
Regarding the Mackie - I suppose, but I haven't seen a Mackie mixer at any of my gigs in a LONG time - usually, it's Soundcraft, A&H, Presonus, Midas, etc...
Regarding Line6 reliability - I'm at over 4 years, and over 300 gigs with my XDR-95, with 100% reliability, so I'm not too worried about it...
Whatever works for you, though...
- georgestrings