I use Flourish Trace and Flourish Iron mainly. I do have some Flourish Excel and it works when you don't have any CO2 hooked up to the tank. It gets good results but CO2 gets better. Excel is a organic carbon source while the excel has the trace elements a planted tank needs. I found that I needed to add iron to my tank so the Flourish Iron is what I use. Less than 2 days and my plants that were suppose to be red but weren't were very red once I started to add the Iron.
I highly recommend any and all of Seachems Flourish line for planted tanks. I haven't gotten very good results from any of the other brands out there (when compaired to what I get now with Seachems products).