We use Simian for satellite formats. Works OK, not that expensive.
For live assist? Depends on the format and how "intense" the format is. You can set up certain function keys as hot keys, or, with added devices, pre-program console push buttons for certain cuts or functions (play jingle, play ID, next event, etc.)
Also works fine for "walk-away" music on hard-drive. We go 24/7 Christmas each year this way. Plays 3 cuts, break three more cuts, break three more cuts, network news. You get the idea.
Service has been an issue in the past but has improved. You get 1 year service with system, they do have a users forum that can be helpful.
One thing to consider with various inexpensive systems is whether you can integrate your traffic and music scheduling software with the system. We use Natural Log and Natural Music (for Christmas), both deliver their logs over the LAN into the respective air machines, which then just loads up the next day's logs at midnight.