One really useful advantage of using replenished developer is that your developer is always at room temperature. I just adjust development time as room temperature varies.
I'm currently using HC-110 (dilution E) in a replenishment regime. When my bottle of HC-110 replenisher is gone, I expect I'll continue the experiments on using HC-110 as its own replenisher that are documented here on APUG.
If I had the space and didn't have as much HC-110 as I do, I would most likely be using X-Tol or T-Max RS (which is another good option).