I print label sheets in the laser, but have also been in the Brother P-Touch camp for 12-15 years.  I have a portable in the van and a desktop version that lives in the office, but I'll sometimes take the desktop to larger jobs for a few days.

They print labels up to 1.5" wide and I've never had the "Flexible ID" tapes come off.  The had an older wire wrap label that was different (kind of looked like fabric) and they didn't stick as well.

All the labels look alike, so you just have to be sure and use the "Flexible" labels when wrapping around wires... the regular labels won't stick.

They have tons of label options (sizes & colors).  I probably own 30-40 cassettes.