Conclusion: Samsung's shrewdly updated BlackJack (now simply the "Jack") builds on its predecessors' positive attributes. It's a compelling Windows Mobile smartphone, even if said OS needs a major renovation.
Pros: Excellent value. Near-perfect form factor. Comfortable keyboard. Includes 3G and Wi-Fi radios. Good voice quality and reception. Solid battery life.
Cons: Clunky OS. Poor Web browser. Proprietary headphone jack requires a dongle. You need to pull the battery to switch microSD cards.