TTC is TTC. Looks like that method uses the pressure tank to keep the actuactors open, so if you are trying to trouble shoot SEQ then that isn't a great method. I think the 2 check valves are eaiser and work fine.
That is the article that I used to setup mine. No problems what so ever. I really didn't want to mess around with wiring open the valves. This way also makes it really easy to convert it back to sequental. Just be ready for a little bit more lag. I have an auto and it doesn't bother me that much, I just like the power band better this way.