No, the Vestax is definitely not worth it.
The EQ/Killer is actually a much better piece of gear...you can run two sources through it (you switch which one goes though the EQ, and the other source just passes through unprocessed), and you have full adjustment over the crossover frequencies...that allows you to do things like filter-sweeps that cannot be done on the Vestax unit.
The dual-source/switching aspect of the EQ/Killer opens some creative mixing possibilities...I tend to mix into the next song with the bass filtered out, then at a certain point in the mix hit the source switch so that the bass-cut swaps from one source to the other....if done right, it sounds very good.
Also very nice about the EQ/Killer is that the switches don't make noises in the audio...and the overall audio performance is exceptionaly clean.
I tend to be very critical of audio gear (as you might have noticed from some fo my postings here), but I cannot praise the EQ/Killer enough...and at $200 it's a real bargain. (You could buy two or three of these for the price of one of those Vestax units).