Like spades? Well, you won't find any surprises here...
Betting is kinda tricky sometimes. It's hard to guess how many rounds you can win. If you don't win enough, you get screwed and penalized. If you win more than you bet, you get bags. Too many bags in a game and you get penalized. You can also bet a nil, which is zero rounds won. You are granted a bonus for this.
The game offers several modes of play, but nothing that strays too far from the standard formula. This isn't necessarily a bad thing, since the game is addicting in its own right. Once you get tired of playing against the computer, you can take the game online and try your skill with some of the other players. This is where the game gets pretty damn interesting. Playing real people shows how stupid the computer can be.
There are several backgrounds and decks to choose from, but none of them are spectacular. There is an option to download more, which makes me assume more support is on the way...but there isn't anything there yet.
Overall, for the 400 point ($5) price tag, it's a matter of taste. If you like spades, you'll like this game, even if it's only for the online play. The achievement system is good in that it ranges in difficulty, and that is always incentive to play more.