If you already know Billy Collins's work, then you won't be disappointed by Ballistics. I've read most of his published poetry to date, but have read it as a poetaster rather than as a literary critic. So I'm not getting down to heavy criticism here, I'm just saying that it has his characteristic voice you'll have come to know and love if you are one of his regular readers. While his work is ruminative it also has warmth and particularly humour. There is a gentle, playful, teasing that goes on in his work. It helps to have a fairly literary or artistic background to read him, since he is a very educated poet. But it's not essential, I'd reckon, as one of his key characteristics is his ease of access. The poems have an inviting surface clarity. You won't bounce off the surface of an impenetrable text when you're reading him, as with some modern poetries. His lexicon and syntax make his poems initially open to all or most readers. So you feel you "understand" the poem on first acquaintance. But don't be fooled. Many of these poems are much cleverer, more intelligent, playfully witty, than you might first think. Don't be put off by that suggestion. Just read the poems and see. Reading Billy Collins is like eating ice-cream. You just keep wanting more.