I've made comments on this topic many times.
I like the over all look of the plant, you have to rule out the other factors before you test a trace. Test kit measure of Fe as proxy for the other traces is a poor method.

I suggest just appearance of the plants, careful inspection etc.
They effects may be subtle to some folks and dramatic to more detailed folks.

I see better health and color, better sheen on most leaves, less issues with the product and less Fe is being wasted apparently.

Rule out the other nutrients and vary the CMS and compare what you see to TMG for 3 weeks each and decide.

I'd like to support a cheap trace, but CMS is not worthy IMO.
But is it that significant? To me it is, you may feel different and certainly many are happy with CMS for their level of trade off issues.

Regards,
Tom Barr