I can’t answer in detail as I haven’t used it in years. I’m sure “it just works” in the sense does it send SMS. However, if a bug crops up or a substantial change in Android happens, either breaking or limiting it…or worse, a security vulnerability is discovered, how long till it’s fixed/patched?
As a rule of thumb, I don’t use applications/software that sees such infrequent updates due to mostly security concerns.