X-Com was a child of its time. It was a brilliant exercise in taking the basic idea of Aliens, which is the basic idea of Space Hulk, and expressing it with Microprose's gleeful love of numbers, courtesy of 90s era computer game design..
Tom, since I know you only play iOS games on an iPod Touch, have you found the small screen size an issue at all while playing Hunters? It strikes me more as an iPad kind of game.
Hunters is a good little game, I picked it up recently to help make the wait for the Firaxis X-Com bearable. Are you playing the daily contracts as well as the campaign? It's a shame the campaign is so short. I also think the manufacturing is rather shallow, but I guess that's in line with the length of the game. I'd still recommend it to anyone who feels October 19th is a long way away.
There really aren't any in-app purchases. You can buy money for a leg-up, which is annoying in the same way EA does it, but they're not trying to sell you stuff constantly.
I can't get past the boss in the campaign. Mission 8, I think. What the heck am I supposed to do there?
So I've been playing the daily contracts, which is plenty to keep me occupied. It also effectively makes this an endless game. Or at least one with enough content to where I might one day reach the end of the tech tree for my characters.