Well, here's my two cents:
Python's are great for filling...but I think they're junky gravel vac's, and waste a ton of water in the process.
The Meridian appears to be about the same...except no gravel vac attachment. It appears to still use a siphon run by your faucet to pull water out of the tank.
For $15 I went to ACE Hardware, bought 25 feet of clear tubing, some fittings, a water bed filler (which is all the python faucet adapter is), and a few bits of PVC
to make my own upside-down 'U' shaped filling adapter, similar to the meridian.
I prefer to vac my tanks into 5 gallon buckets. the suction is stronger than with a python, its easier to gauge how many gallons I removed, and it wastes significantly less water.