If you're looking for a marked deck that you can use for mental effects or the casual card trick, Wild's deck is a good choice. It is a Bicycle deck that looks and feels like the real thing. You can use the deck for several effects before going into the marked deck trick and you might be safe. The marking system is relatively easy to learn (about 10 minutes to get really good at reading the card backs without looking like you're doing so), which makes this perfect for hobbyists or someone just needing a marked deck for a new effect they're working on that has almost a zero chance of failure.
Unfortunately, the ease of reading the marks is the major weakness of the deck. While you can spread the cards and have the spectator choose one for any number of effects beforehand, it will only take them a few seconds to find the mark and even if they can't figure out what it means they'll know the deck is marked. To be fair, Wild includes 3 unmarked Jokers in the pack, so if you're slick enough you can pass these off to the spectator who wants to examine the cards. Still, it won't fool everyone every time.
That being said, if you've always wanted a marked deck but didn't want to spend hours learning the markings, you'll love this. Likewise, if you want a marked deck that you almost can't miss the reading on, this is for you. Most everyone else, however, will probably want to move to a more professional marking system that's worth the effort to learn.