Thanks Darryl, this has all been very helpful. One more question for you, and the community. What do you concider "stable"? I usually look at the current SG and the previous 2 or 3, and look for a change of no more than 2 -4 over any of the 5 minute periods. MM says anything that's within 20% (I guess of the prior SG) is okay. The example of "unstable" they gave me over the phone was rediculous - a change from 120 - 210. I described 2 senarios and asked if one was "better" than the other. Senario a) 4 SGs in a row of 110, right before a meal, not having eaten for 3 hours Senario b) SGs of 110, 120, 130, 132, right before a meal not having eaten for three hours. They said both were equally good. What do you think?