I realize Plesk has bugs. I'm facing a variety of them myself on an administrative level that is slowly becoming nightmarish. But I am still standing by them.
I use a seperate company to provide all our Dedicated servers for our hosting. They swear by plesk. Currently Plesk is working on patches for all problems. One by one, but the major ones that affect direct functionality of the software or server have to come first, and there are those. I've already located two that directly affect the general usabitility.
I recommend giving them a chance and at least two months. This is a brand new product and it is now getting more use than it ever did, or could have, as a beta product.
Larry Stevens
CTO
DDI Hosting