I've been using them for 2 years now. I finally decided to try them after fighting the surge growth in the spring combined with what seemed like endless rain. I really like them. I figure it costs me $60 acre for the product. I seem to get 4-6 weeks of controlled growth in that amount of time. By that I mean I might come back after a week and only see about 1.5 to 2 inches of new growth. For me it's more of peace of mind. I can't control the rain and it kills me to have to fight 6 inch tall grass each week. I'm double cutting and when it is wet it looks like crap. PGR's have helped me with all these issues. I know when I come back to the lawn I won't be fighting a jungle and even if it's raining I know I can cut it and make it look good. We use it on bluegrass and fescue lawns.
I've used Podium and T-Pac in the past. I'm curious as to how well Embark works?? It is considerably cheaper and work use it if I found it produced the same result.
Save your investment go synthetic
4 Toro walkbehinds
2 Toro Z Masters
1 Scag Tiger Cub
1 Lastec 28hp 61"
Trucks, trailers, and lots of trimmers, blowers