"Fans of Queensÿche and older Fates Warning should like this one as should fans of classic heavy metal, as "Purification" sounds like somewhat of a blend of QR, FW and the likes of Judas Priest and Mercyful Fate/King Diamond.
The album certainly is an enjoyable listen which emphasizes melody and compositional quasi-complexity over aggression and heaviness. A number of rather heavy riffs are found, nonetheless, on the album, which quite successfully balances heaviness and melody making use of, among other things, heavy one-chord riffs and melodic twin guitars.
While not quite reaching subsequent AG albums in terms of quality, "Purification" should certainly be acquired if you like not-too-quirky progressive metal!"