Depends on your volume, of course, but seems expensive. 1 million jobs scheduled, 4 steps per job? $200. And you're locked into their API. You can have 8 worke

Depends on your volume, of course, but seems expensive. 1 million jobs scheduled, 4 steps per job? $200. And you're locked into their API. You can have 8 workers each polling an Amazon SQS queue once a second for $19/month. Having had huge problems with their queues (3 minute lags, spurious duplicates) I'm wary of Amazon's polling-based API. SWF's long-poll feature is smart versus SQS, however.