First: Troytechs arent a study guide, they are a cheat sheet. Use them like they say and you will pass. Whether or not you want to know how to do anything with NT is up to you and your employer. You'd never get past an interview with me if all you did was troys. Many places would hire and then fire you. If you know your stuff and use Troy to make sure before you drop the $100 for test, hey that's cool.
Second: I may believe that it's possible to pass a MS cert test without studying, but I would sure like to see it. I've taken a dozen of them myself, and I have found that the questions only represent real world scenarios in somebody elses (BillG.) world. I dont see how you could get the experience, particularly in networking that MS tests you on. For example, in the MS testing world, nobody makes a router that isnt built on a NT Server on box, same for dial in or VPN services. Most of those questions have an answer in the real world along the lines of "buy a cisco", instead of "build a PII with 128mb and 6 nics hooked to 12 port hubs...". I understand it is a test MS products, but who really builds an enterprise networks with NT servers as their routers?
The tests are really center on the exceptions rather than the mundane. It soes sort of make sense, anybody can run, design and fix a normal network, but it takes exceptional people to handle the bizzare, unique and just plain FU'd networks.