I tried Sicce Voyagers before the Evolutions and was not very pleased for a couple reasons. First they are physically bigger so take up more real estate. Next they draw almost 3 times the wattage as a comparable Evo. And the mounting on the original Voyager really sucks, every time you touched it it fell out of the plastic bracket and required two hands in the tank to spread the bracket back out and e=reinsert the powerhead. I also though the adjustable flow would be cool but it wasn't much good. I traded the Voyagers for frags. I did a write up on both the Voyagers and the Evos at azreefs.com .
