I'm a huge fan of BATS and their quirky alt. prog sound. To me they've always reminded me of what Voivod could have done if they had retained their balls after Nothingface instead of releasing the streamlined and neutered Angel Rat. Alter Nature seems to pick up where The Sleep of Reason left off except it is even more abrasive and less catchy. Granted, that means Alter Nature is going to take longer to finally click, but it is well worth the effort. Underneath all the angular rhythms, screamed vocals, and abrasive sounds is another excellent BATS release.