I used to, but then I went to 8.5, with ESV and now 8.0, however, a few months ago I mixed things up and bought a different brand, mainly to simplify things by not having to weigh out 4-components and ESV is also like 65% more expensive. But even then, that's only like an additional $20 per month, so price is was only secondary.
I just looked at my notes from my ESV water changes:
Mixed at 1.025 / 1.026 using a basic refractometer with Randy's calibration solution and a Hanna Alk checker all of my results ranged between 8.8 and 9.1 with most right at 9.1