Hi,
Herewith my two cents:
1. Yes, it is completely stable. The few issues I find from time to time are not even worth mentioning.
2. Buy an Ajamsonic upgraded Audya direct through AJ.
He'll give it to you at a good price & I guarrantee fantastic support. Not to say you will not get support from another dealer, but AJ has proven himself over & over again and in any case you'll want to upgrade to the Ajamsonic version sooner or later.
3. Once you get used to the quality of the Audya's overall sound, nothing else will ever do it again for you.
Cheers mate,
Henni
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Make sure you'll fly forever!