@arendleejessurun worth checking, you can pick one up for not much. The 86 was similar (black body instead of grey) but it had a pronounced high boost which could make it awkward for live work, the 87 was smooth. Some engineers preferred a presence/high 'bump' but I wasn't one of them, not on a stage littered with 400W JBL wedge monitors!
A consensus amongst the golden eared was that the 58 beta offered a lot of practical advantages but had lost a little 'something' tonally over the original.