It's more consistent and you don't have to mix a new batch every week.
I put food-grade mineral oil in the bubble counter. Water in the counter evaporates. Food grade mineral oil is used to cure wood cutting board. You can find it at the hardware store.
Get yourself a couple of check valves for the CO2 line so the water doesn't back up into the bubble counter.
How are you getting on with your CO2 equipment? I have mine running on a plants only tank for quite a while, and I am happy enough with it. I had to replace the bubble counter early on as well as one of the diffuser dishes. I went for the Aquatek 3 in 1 diffuser with built-in bubble counter. Works great!