Adequan experiences?

I was wondering if any of you have had to or chose to try the Adequan shots for your dogs? What was your experience?
My Lab mix is 13 1/2 and arthritic. (in the pic) He was also recently diagnosed with Lymes disease which was caught very early and being treated with Doxy for a little over a week now. He is on Glucosamine with Hylouronic acid (sp) supplements but it seems he needs something more. I have researched the internet and it seems there are no side effects. I am certain that we are going to move forward with this but curious to know how it has helped your dog.
Thanks in advance