They really are!
For musical innovation, intensity, instrumentalism and general prog metal magnificence, I urge you to buy 'Ghost Reveries' by Opeth.
(bazmorningstar efil4nat3b, Wed 1 Jul 2009, 13:54, 2 replies, latest was 16 years ago)

I may already have it
I have a number of Opeth albums, not sure which though as my other half got them...
( Vipros. clever got me this far, then tricky got me in, Wed 1 Jul 2009, 13:55, Reply)

Listen to it, dude.
The opening track is magnificent but the real magnum opus is 'Beneath The Mire'.
(bazmorningstar efil4nat3b, Wed 1 Jul 2009, 14:08, Reply)

You heard "Crack The Skye" by Mastodon?
I can't recommend it hard enough.
( Cawl, Wed 1 Jul 2009, 13:56, Reply)

I've heard some Mastodon - dont know if I've heard that one
What I have heard I find a bit too straightforward and not quite proggy enough.

They supported Tool a couple of years back and I found them fairly forgettable.

Mind you, Cynic supported Opeth last year and I felt the same but have subsequently acquired and admired their album 'Traced In Air'.
(bazmorningstar efil4nat3b, Wed 1 Jul 2009, 14:06, Reply)

I thought much the same about their
Older albums, but this new one is pretty special.
( Cawl, Wed 1 Jul 2009, 14:41, Reply)

I will investigate so.
thanks.
(bazmorningstar efil4nat3b, Wed 1 Jul 2009, 14:42, Reply)