Tremendous. I use this pedal with a strat and mostly on clean and legato or clean and crisp tracks. The first sample setting in the manual called "Magic Dust for Single Coils" is where this pedal stays every time it is on. It brinds out the best in my strat's Lindy Fralin's.
I ran this against my buddy's Keeley 4 knob compressor. I liked the Tone press for all the lighter compression and the Keeley for really compressed country stuff. Since that is not what I play, the Barber was the better fit for me. Plus it is $100 cheaper than the Keeley, and if I wanted it to do country spank it can do that really well - just not as well as the Keeley.
Reliability/Durability:
Great do far after 2 years of use.
Ease of Use:
Crazy easy to use.
Comes with a manual with sample settings that are helpful as well.
Only reason it is not a 10 is because you might spend a little time getting use to the fact that adding sustain requires bumping the vulume a bit to keep the sound level in the same place. But it is very intuitive.
Customer Support:
Never had any interaction with the good folks at Barber Electronics. But I have heard they are quite friendly and helpful.
Overall Rating:
I think this is essential for adding that extra mojo to single coils, when you want clean and crisp sounds for alternative/indie music or whether you want your notes to have more sustain when you play some melodic cleans. I would buy this again if it was lost or stolen.