It's tough to single out what I like best about Optimum products... one big bonus is the availability of small, cost-effictive sizes for trial purposes! I've been wishing for this from all vendors and manufacturers for a long time.
Opti Seal's ease of use and brilliant shine are at the top of my list. It's versatile too. I used it on my glass shower doors and kept right on going to the tile and grout. It looks superb on my chrome toaster too!
I had read a report somewhereorother on using a dab or two of OPII with M105 to extend working time and lessen dusting. I'm happy to report this also worked well for me with the original M105.
ONR is not only a great rinseless wash, clay lube and QD, I also use it at clay lube strength as a spray & wipe type product.
Like to try:
I see great reports on both of the OCWs... Optimum Car Wash and Optimum Car Wax. The wax is reported to be more than just a spray-wax topper but has the longevity to go the distance as a primary LSP.
I also see glowing reports on Optimum Power Clean. Wouldn't mind giving that a run around the block as well.
Major kudos to PAC/CMA for adding the OPT line.

Not only are they great products the support is superior as well... Dr. G. answers e-mail inquiries personally and promptly!
TL