I have tried Lr Baggs element, Fishman infinity, M80, palathetic(takamine), Elipsis blend. I have friend who own LR Baggs anthem and I was deciding between trinity and anthem.
Trinity does a better job representing the guitars original sound and the mic/transducer is much better combo imo than mic/piezo.
The only downside to trinity is that you have to use a balanced(stereo) cable coming out of the guitar, and you always have to carry the preamp that convert stereo to the regular mono cable.
Had this installed on my 3rd guitar, a 2013 Collings OM2H guitar. Lots of people reviewed the sound of the pickup. Nobody mentioned that the Trinity system came with one of the best sounding microphones in a pickup system. With the blender, the sound of the microphone in itself alone was outstanding. It brought out the true character of my guitar. To my ears, I preferred it over the pickup. However, gain settings must set correctly in order to prevent feedback. Crystal clear highs, warm full body acoustic tone without the quacky sound of your typical piezo under saddle system.
I already use a K &K Trinity system on a English made Manson Magpie OM guitar. When I added a 2006 Collings OM1 to my collection, there was no doubt that the K & K would be the pickup system for it. Finally had it installed by a qualified luthier. Led worship yesterday at church, and the guitar sounded everything as good, only plugged in. The K & K amplified the true dynamics, timbre, acoustics of this great guitar. The notes were stunning, there were no discoloration, distortion, quackiness, just pure acoustic bliss. I would be buying another one of these for another Collings OM2 guitar I recently purchased. My signal chain is Guitar to K & K blending preamp ==>acoustic amp=>Radial JDI DI BOX =>> soundboard
Had the Trinity system installed in my Guild F50 by a local luthier. Could not be happier with the sound. I am running the guitar stereo cable into a DTAR Solstice then out to a pair of powered QSC K10 PA speakers, this is my basic setup. I am able to not only effectively blend the mic and soundboard signals with the DTAR but also eq both signals independently to really dial in the desired tone. I have found that the best blend setting is about 30% mic and 70% soundboard with almost all the low eq rolled completly off and mid and hi eq's set at flat. Proper QSR speaker placement is a must to avoid any feedback from the Trinity mic, just experiment with speaker location at home to get a feel for what works best for you. I also have a Pure Minii system (without the mic) in my Guild J30 12 string and will be installing the Trinity mic upgrade soon. I have tried a dual source Sunrise magnetic pickup with a Fishman UST piezo for the past 10 years and I would say that the Trinity has a dramatically improved natural sound.
I've got K&K for a week and can't be more happier! Before that I had LR Baggs M80, it sounds great but it's somewhat bulky and changes the sound of the unplugged guitar so I had to remove every time I wanted to play unplugged - very annoying. K&K Trinity compared to M80 not only doesn't change the sound of my guitar, it sounds fantastic when plugged through an amp. Installation is pretty straightforward, I did it myself and that wasn't that hard. The microphone sound is a bit boomy and needs some minimal eq'ing. I haven't tried Trinity Pro Preamp yet, I ordered it separately and it's on its way now. But the sound I get now through an 2-input audio interface is really amazing! Thank you John.