I still kinda go back and forth between using the weather channel for some points and the mPlaces app for some points. That way I get the achievement points from both apps faster. I also tweet daily from both places and do the survey from each place daily.
The points do carry from one app to the other, altho it may take a few minutes for them to show up on the app you didn't use to earn them.
On the way home from work. I drove by Home Depot (2 different ones), Target, Denny's, Sprint, T-Mobile (2 of them show up at the same intersection), and Cricket for 485 points.
I'll go out for a little bit later and use the rest of my daily check-ins by going by the same places again.
in the month of July, I've redeemed for $20 in Target gcs and will have enough points to redeem 1 more before month's end. Some of those points were earned toward the end of June and redeemed early July.
It doesn't earn a ton but for basically doing nothing, I think it's great.