Not much to show as of yet, I am more or less in trial mode with it now. I've used guano in previous grows but I can't really say they've been properly organized enough for me to draw any real conclusions. Organization as an aspect of growing is one of the more challenging hurdles for me. I know if my grows were more organized it opens to door for increased efficiency, better understanding, enhanced/perfected methods and a higher quality product.
This is what I am working on with a couple flowering plants (just beginning), several freshly rooted clones and some new strains started from seed. My goal is to track each plant more individually and take solid notes.
Guano is quite potent fertilizer, some would even say it is too strong. You can mix up smaller amounts in water but it is good to have an EC or PPM meter handy. I am mainly using the Peruvian seabird (10-10-2) for all plants at this stage (except the seedlings). The pellets take a bit to dissolve, but it doesn't make the solution acidic at all. In fact, with the PSG alone the pH of the solution is 7.5+. With the addition of molasses, and optionally a couple supplements like Liquid Karma or kelp, the pH goes down to about 6.3 or exactly where I want it.