I cannot help you on use with aspire Atlantis.
I have the
istick 30 and have read minimum problems with others who own this brand at 30w.
The 50w is another story. You should do some research and make your own determination.
Whatever you choose, make sure you try to find out the merchandiser/vendor/supplier return record (in regards to acceptance of faulty units) of the vendor you bought it from. The vendor must be an authorized dealer from the original manufacturer if you ever need to return it and receive additional factory support if needed.