Update:
Great app and great dev who listens to users - 5 stars.
Previous review:
Another app that needlessly *requires* iOS 5? There *are* people who, for various reasons (battery issues, bugs, incompatibility with older *important* apps), don't want to upgrade to 5.0 - maybe when 5.1 comes out if Apple decides to seriously put some effort into fixing the problems.
Anyway, I have to give this one star for not being compatible with, at least, 4.3 when it and just about every app out there *should* be. I'll change my rating when this "bug" is fixed. Thanks.