I'm a sucker for technical skill, and Sandman is top-notch. Internal rhyme, crazy cadences, alliteration, punchlines...he's got a unique knack for rhyming things that sound exactly the same...it's wordplay, but taken to another level ("Low Co.", "Calm Tornado", anything he rhymes on). With that said, this album's got his humor ("Mean Mug"), his Native Tongues-ish vibe ("Strange Planet"), personal narratives ("Being Haved", "Listen"), food for thought ("Angels With Dirty Faces"). This is the range of stuff you expect and deserve when you buy a rap album.
He doesn't go over whack beats either, a common theme for the vast majority of his records. I'm not going to try and describe beats, but again, there's something for everyone. Besides the rhymes, I think this album stands out a bit more from his others in its sonic coherence (there's no "Cedar and Sedgwick" or "Let's Get 'Em" on this one).
If you haven't heard Boy Sand, I would definitely recommend this album for your first listen over his other full-lengths. It's his most consistent LP, perhaps a bit more accessible to a newbie, but also diverse enough to give you a taste of his wide range of incredible skills/strengths. If you have heard him, why read this? You know how ridiculously skilled and progressive he is...buy it.