I do have one. It's a PACT BBK II and while it works some of the time, I really don't trust it enough to rely on it 100% if the time. Things like wireless phones, florescent lights and power fluctuations affect how it reads, or doesn't read.
Constantly zeroing it to assure it's okay, then after a few minutes, it's on the fritz so I zero it again.
I use my beam scale for most of the work, only if I wish to check a weight while loading do I use the digi. I also double check the digi with the beam and vice-versa.
It's too bad because it would speed things up a bit for measuring, but not worth the chance if relied upon 100% of the time.
Maybe it's my brand, but I have heard many stories similar.