Depends on the beginner.
Reality Twister is really for one-on-one performances, so it's a natural for impromptu situations, where the person you're performing for doesn't even know you're doing a trick. You can easily present the lens as a "weird illusion", which is entirely believable, and then the twist in the pen comes as a fantastic surprise and deep mystery. This kind of presentation requires some skill -- a bit more than it first seems -- but you know, every kind of presentation requires some skill. You've got to start somewhere.
However, Reality Twister, although it requires no physical skill, requires some confidence in audience management. Many beginners get a little nervous when performing (many experienced magicians, as well), and if you're one of them you may want a trick which is a little less delicate this way. In other words you may wish to develop your ability to control your audience by doing tricks in which it is not so important, before you tackle one in which it is.
But if you're ready for that challenge, I can tell you that Reality Twister really stuns people, in a deep way which many tricks can not, because they are obviously tricks from the start. If you pull out a packet of cards and do the best packet trick in the world, people will be amazed and entertained, but they knew you were doing a trick. With Reality Twister it's not too hard to get all the way to the final revelation before the spectator has any idea there's a trick. There seems to be a small but fundamental difference in tricks of this kind.
This kind of trick is especially well suited to amateur magicians, regardless of their level of experience.