On this subject I would say it's all about an individual personal preference.
I've had several TR sights, the Flatliner, the Matrix, Matrix Steel Pin tech and will say I've had my share of problems. One in particular, is getting the sight bracket to stay tightened to the windage bar and also the windage bar to the elevation bar. Nevertheless, the customer service at Trophy Ridge has been exceptional (I'm speaking for myself here) and with 'all' the difficulties I've had with the TR sights, the company immediately responded and resolved the problems--all free of charge, total warranty coverage. That impressed me quite a bit and I continue to support the company as this company supports my needs.
One day they'll get it right, now that the Mantis and Guide Series are out, it sure looks like they're heading in the right direction.
IL-Cornfed a member of this board has provided us with a picture of what the mantis looks like on his bow.
Along with the TR sights, the Spot Hogg are 'great sights', I also have the Hogg-It and that's one hell-of-a sight, but they're also quite a bit $$.
This is a sight you can tune quite easilly and have all 3 axis adjustments.
The Copper John, like I said earlier, it's all about personal preference--I found that the CJ sights are good, but there seems to be a problem with the 'red fiber optic' in particular, but there a large selection of sights on the market today---but I'll say one thing to end---you will never go wrong with a Spot-Hogg sight, they are really designed well--not bullet proof, no sight is, due to our 'own fault' sometimes and I would say, if you have the cash go for the Spot-Hogg. JMHO.