Who's tried Innova Senior Plus?

I was thinking about trying my 10yr, 11month old minpin on Innova Senior Plus.  Right now he's on California Natural Chkn/Rice puppy and doing pretty well (I feed yogurt with it in the morning and canned cal nat in the evening).  He's also on DGP for his arthritis- been on this a week now. I'm not sure if I notice a difference.

He was an agility dog for a while as well as obedience and also will chase ball non stop.  He was always very hard on his feet when running agility- full speed ahead if you know what I mean! :) 

So he's getting stiff and sore now and it makes me sad to see it.  I've tried him on liquid Syn-Flex and it did seem to help.  He hates the taste of that though, so been looking for a treat type gluc/chond/MSM type supplement.

Probably will take him in January to a vet (we just moved again!) to talk about pain management for the little guy.

Anyway, anyone feed this and have good results?
Thanks
:)