Totally worth it. I can't believe how much my amazon sword has grown in a mere month. I bet it has trippled in size. The leaves were maybe 8 inches, and now they bend at the sursase of my 18" high tank. My grassy plants has thrown off more runners in 3 weeks than it did in 3 months. My val is going nuts! Again. Maybe 10 inches when purchased, and now the 18" high, and spreading at least another 10 across the surface of the water!
I had no idea it would be this beneficial. And I'm using a system that is only designed for a 20 gal tank - and I have a 35. I'm going to transfer it to my new 90 that I'm getting to see what it does in there.