To answer your orgianal question, yes an e-tek is value for money, even brand new the're awesome markers and worth the pennies if you're going to use them.
But like everyone has said, be careful where you buy them from, if you're not going to buy one from Planet or another creditable paintball shop then you have to careful you don't get scamed.
And there's no point in me repeating what everyone else has said about inport tax, but look at buying in the UK first.