Some comments on previous boardgame apps I bought:
Samurai: Tad more expensive but definitely a very polished product. Online implementation is fantastic. If I use Word with Friends as a benchmark for asynchronous play, this beats it for the ability to set a time limit for each move and online leader boards. I purchased it primarily for future iPad play (but got it now in case of price increase), but I've to say, I'm enjoying the AI/online play tremendously at the moment. I've never played Samurai before I purchased the app. It's probably not a game I need to own a physical copy of as it can be somewhat abstract, but at US$4.99, it's a steal as a substitute.
Neuroshima Hex!: Also a game I've never tried before I bought the app and I must say I rather enjoy it. Playing it even more than Samurai even though it's just against the AI. It is priced more attractively due to lack of online implementation at the moment but developers say it's 'akan datang' (on the way). Suspect price will go up then, so I decided to grab it first. Also another game I don't need a physical copy of, but I can see myself playing it with others over an iPad.