Multiple Jiras into one MSProject eh? That’s a weird one. I can’t imagine that’d be possible but the person to ask is Sergey Gussak, Ceptah Bridge’s author (firstname.lastname@example.org).
I think the product is simple and well-designed. I never found it to be buggy. My bigger problem was with my own ignorance of MS Project and Jira – and that was a large learning curve. If you’re not well grounded in both you’ll find the instructions for Ceptah Bridge to be terse and not particularly kind. The best thing to do is work through a bunch of use cases with demo Jira databases and MS Project files until you’re very clear on what you need/want to do. You’re likely to need your Jira admin to craft some custom fields for you as well.
IMHO Jira/Project/Ceptah are a killer combination letting you stay on top of the complexity of a rapidly shifting software project.