I find Trifield to be absolutely amazing, and the #1 reason I own Meridian gear (568 & 518).
With the 1,300+ redbook discs I own, it's a godsend.

As others have mentioned, Trifield (as well as Ambisonics, and heck all multi-channel systems) depends on absolutely correct phase coherence and delay settings from the speakers.
When I finally got all my speakers dialed in (using ETF to validate) for phase and delays, Trifield (with ‘delay` at zero) works like a champ. The ‘width` setting also has more noticeable impact when everything else is correct.

I do find that Trifield adds a bit of bass to the mix, but that`s not such a bad thing.
Actually, with older recordings, I even kick in the DBX sub-harmonic synth on my DBX DriveRack 260 speaker processor. That adds a nice foundation that was missing in the recordings.

My speakers are Martin-Logan Monolith III`s, Logos and Sequel IIb`s. Large electrostats supplemented by a 4x15” infinite baffle sub.

While stereo (‘Direct`) sounds fine, Trifield is just simply superior in all ways on my rig.

Jonathan
My System