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but i assume a somewhat nicer interface than the internal VOP intrinsic stuff that sbcl has always had

Still better than no SIMD at all imo

Yup. I used to use Clozure CL all the time, but since the code I write tends to involve lots of number crunching, SB-SIMD and Loopus are indispensible.

Even before SB-SIMD, SBCL has always seemed like the best Common Lisp implementation for any arithmetic. Or at least this seems to be case when you benchmark CCL against it :)

That's what I mean by "willing to hack"! Getting the compiler to use SIMD instructions is actually pretty easy- you just specify where to use them and let it handle them. Then you pinky promise that your array really is made of floats and turn safety off.