Thanks Bill, i did not know that.. I know maple turns gray after a while.
I have another box of cherry, i bought it around Christmas and and i still have a few blocks left. I guess i'm good for a while...
For the past few years i used almost exclusively cherry and apple chunks, mostly from Lowes or Home Depot.. not the best quality but good enough for Webers... i understand SI works a bit different, i'm sure i'll mess up a bit 'til i get the hang of it (eg. i never weighted the wood before not did i put the meat in a cold smoker). I'll do some ribs today, keep my fingers crossed