I have both a Wave and Surge, the Surge sees EDC duties, yes it's heavier than the Wave/Carge series, but it has the following advantages;
beefier pliers, but still the thinnest needle-nose tip of any current multi (Vic SwissTool series, Gerber multis, I think Sog has similar fine needlenose tips though)
the Blade-Exchanger, I currently have the file fitted, great for quick knife touch-ups on the diamond side
outside-accesable scissors, and a nice, solid set of scissors at that, the Wave/Charge scissors are nice and all, but they're a little wimpy
decent sized One-Handed blades that actually sharpen up quite nicely, no they're not the latest Übersteel, but they do take a nice edge and resharpen easily, and it's nice to have two seperate blade styles on dedicated blades (I *HATE* Combo edges)
only *one* dedicated flathead driver, I *HATE* multis that have 42+ useless flathead screwdrivers ranging in size from "Crowbar" to "Microscopic", it's a cheap, cheating way to up the tool count on a multi without adding any *real* functionality
It has an Awl, great for poking holes in things, and scraping, I use it to scrape old thermal-transfer compound off the heatsink plates of the G4 iMacs that I repair
the Wave/Charge are also great tools, but for my purposes, the Surge has a more useful toolset, and as I carry it on a horizontal belt sheath, the weight difference is negligable