Synthesized IDs are quite popular with stations, but are extremely difficult to decipher under poor, or even sometimes average, listening conditions.
There's an interesting paper here that discusses the problems older listeners have with understanding synthesized speech. Much of it has to do with missing frequency content:
http://www.sparc.ac.uk/media/downloads/executivesummaries/exec_summary_wolters.pdfI suspect the same problem plagues shortwave radio, due to interference, and the narrow bandwidths we sometimes have to employ. (Not to mention the fact that there's a lot of older listeners)
This is not a criticism, just a tip - if you want listeners to be able to figure out your station name, make it as easy as possible. This includes having a clear ID, spoken by a real person.