I must respectfully disagree with Ron here on the three reasons being three strikes, however, you must know that if you do use this for a live site, every REASON he listed are GREAT causes for concern, so the true question really should be…
*IF* you are going to be using this for a live site and you want it to be able to notify you when you get an order you will need to try and figure some things out on your own, in fact, some hacking will be required.
Further, this hacking could cause further instability.
Even Further, how will this hacking effect things when notifications are incorporated into the Magento release?
In a prior post he has compared it to shooting yourself in the head.
I don’t think its quite that bad, but if you use a preview technology in production you are going to A. Be able to reflect to the Magento team what works and what doesn’t far more rapidly then many beta testers and B. risk instabilities so you better be paying close attention. Further, when the stable version does come out many of your customizations will have to be redone, not to mention some data may need to be re-imported. Hopefully, not manually.
So, I have given even more reasons not to use it, but to tell you not to is not something I will do. I believe the Magento team will add this feature in due course. Is it usable… yes, mostly. If you are willing to deal with all of these caveats, great. But you have opened yourself up to those headaches, instability, and unforeseen security issues.