K&K Trinity Pro - Great from the first strum
I have owned and played several acoustic guitars live over the years. I have had many different types of pickup systems including sound hole pickups, USTs, and an old barn door blender system. I was in the market for a dual source system in my new HD-28v, which has the long saddle, so I knew I needed to go with soundboard transducers. This system fit the bill perfectly.
I installed it myself to save cash. The install took a bit of time, but I have never worked with this type of system before and didn't want to cause any damage to the pickups, mic, cables, not to mention my guitar's finish! I imagine if I ever install one again, the installation time would be drastically shorter. To test it, I ran both sources at 12 o'clock and plugged in to my acoustic amp which runs into a large auditorium PA. It sounded like a dream come true. Since then, I have blended more microphone (pure mini - 12 o'clock, mic - 2 o'clock), because I like a bit more "air" in my mix, but there's honestly not a bad mix for me. Both sources sound good enough to stand on their own, but they sound like heaven when combined.
I lead worship in front of a full band on a large church stage (acoustic drums, piano, bass, electric guitar, four vocalists), with wedge monitors. I run my guitar through the monitor mix, and also through my acoustic amp next to me, and I have had exactly ZERO struggle with feedback. Not even the first hint--and I feel like I run it at a decent volume. That was one of my main concerns. Another concern was the possibility of having to tweak EQs on either source (I purchased the system with the "belt pack" preamp, with tiny little EQ pots), but I have not had to make a single adjustment. There has just been no need.
Bottom line: the K&K Trinity Pro sounds like my beloved HD-28v, only louder. Isn't that what we are all after?!