Simply put, this is one of Tull's finest efforts. It marked the departure of Mick Abrahams and the arrival of Martin Barre to the band and signalled Tull's move away from a blues outfit to the quirky, progressive rock force they would become. And even though this was just their second album, it remains among their best and contains a number of standards including "A New Day Yesterday," "Bouree," "We Used to Know," "Fat Man," and "For a Tousand Mothers." The additional bonus tracks make this classic that much better.
The two things which stand out most on this album are Martin Barre's guitar work and Ian Anderson's personal, yet still somehow timeless lyrics. For the former, the best tracks are probably "A New Day Yesterday" and "For A Thousand Mothers," both of which are still Tull concert staples, as is the Bach cover "Bouree." "Nothing is Easy" is another great song with some catchy licks and is a nice tune to listen to at the end of a long work week with an ice cold beer in your hand.
So let's put it this way, if I were stuck on a desert island with a handful of CDs, this would be one of them. And I own EVERY Tull album, including the solo efforts of Ian Anderson and Martin Barre. So enjoy.