I have used CUs for over two years and consider them an essential part of my regimen, which also includes finasteride, minoxidil and Nizoral. I use Folligen, which is a lot cheaper and stronger than Tricomin. I tried Tricomin too, but then switched. Loren Pikart invented both, and he claims that his research shows that the approach used in Folligen is more effective than the "first generation" CUs in Tricomin. However, Tricomin has more published studies behind it, but the formula in the actual product is weaker than the formula used in the studies.
I buy Folligen directly from Pkart's company at skinbio.com.