This album is one of the undiscovered great albums, more people should know about Sleep. It's one of the finest heavy rock (stoner rock?) albums in the known universe. Matt Pike (guitarist) studied at the Iommi school of riff and graduated with honours because this is the most Sabbathy band that wasn't Black Sabbath that I've ever heard. It's rare for me to find an album that I could 100% reccomend, but if you like Sabbath you'll dig this.
The lead work is very tasty but at the same time has a slight psychedelic sloppyness that adds to it's charm, and the riffs are huge, there isn't much going on vocally and the lyrics look like they were written while stoned, but this all adds up to a brilliant album that's far more than the sum of it's very heavy rifftastic parts. If you heard "Jerusalem" by Sleep and were intimidated/put off by it, don't let that deter you from this.
This sounds more like Sabbath than Dio era Sabbath. There's no stand out best track for me, the coolness doesn't let up. For anyone into Sabbathesque heavy rock, or the Stoner Rock Sleep helped pioneer, buy this.