I also have a EquiCore 1800 and DeepCore 1800 and was surprised at how large a difference it made. I was living in an NYC apartment at the time.
There is a used pair for sale for $1800 on another site right now.
Opinions on efficacy of these products varies a lot, probably due to both subjective and objective factors. I remain curious, myself, but to at least do the minimum, I put in dedicated lines. After that, I would likely want to get something well-regarded and used, so that if nothing comes of it, I can resell. (Or get something on a trial basis.)