Eternal its solid and the lyrics are strong. I'll dedicate some more time listening, but so far, some tracks are the best tracks I've listening from them since Infinity album. The Lost Saga is easily a top track in the "Top 10 tracks list" of Stratovarius.
@sls, Visions for me is their first "modern power metal album". If you like that style, you could go forward with Destiny, Infinite, both Elementses... But, if you ask me, Episode might have better songs than any of those, although those are all really good albums in any case. So, grab Destiny if you want one. Or, if you like a bit older stuff where the style wasn't that stabilized yet, then Episode. :)