The ion will do him just fine and get him into the realm of electro guns with multiple firing modes. On the plus side, he can also find upgrade parts super cheap on sale or used.
I still have two IONs, one with just a barrel and then an XE fully upped. My friends that never really got into paintball, when they shoot the stock one with the barrel, they think its a high-end marker until i tell them that its actually just a super affordable entry level.
Your brother will enjoy it i'm sure
btw- just make an offer on this one, start with 160, and work your way up to 200 (which i'm positive he will take). Not only do you get the XE version (which is the better one with the bolt-out back), but it also has mods: blackheart Circuitboard, Freak Barrel, decent electric hopper that will go well with that marker, paintball mask and new red blade trigger. It gives you the whole package, as well as a spyder victor so he can have a backup gun in those occasions something goes wrong on the field and he doesnt have the time to fix in between matches.