Yeah mate. The Egos are poppet based markers whereas the Geos are spool based. The egos have been going since 2005 whereas the geos have been around since 2009. Both are massively popular with the latest versions, the Geo 3 and the Ego LV1 being used by alot of teams out there. The egos are absolutely solid, massively air efficient and require very little maintainence but they make a hell of a bang and feel quite large in your hands (personally i like this but thats just me) The Geos are alot quieter, feel alot smaller, some people would say are more accurate but thats a whole new story but are less efficient than the egos. To be honest, if you buy either of them you'll be onto a winner because anything Planet produces is solid gear. Ego 8's go for around the £200 mark, Ego 9 for around £250 - £300, Ego 10s for £300 - £350 and Ego 11s for £400 +. The Geo's im not so sure on but i think Geo 3's are going for around the £500 mark.