Not much experience with that particular model, but I'm sure it sounds alright. But personally, I favor omnidirectional mics as they don't have the proximity effect (increased bass response when you get up close) that cardioids (such as the MD46) do. My own personal setup is an MD21 (omni) for regular interviews and a MD441 (hypercardio) for noisy type environments where the ambience just gets too much - such as trade shows, motor events or something like that.
What is good about mics such as the MD46, RE50 etc though, is the fact that they're long. You don't have to hold your hand as close to the person's mouth and this is good since some people don't want you in their face. Also, the reason tv stations like long shaft mics is because they typically put a flag on it, with their logo. And you dont' want your arm in picture because that looks odd. So if I did tv, I would probably favor a long mic over my 21, for aesthetic reasons.
Don't let the stereo vs. mono thing I said fool you btw - one person talking can never be more than mono... because it's just 1 sound. So interviews are almost always in mono, as are 99% of all mics. There are stereo mics out there but no one uses them for interviews. Stereo mics or stereo pairs of mono are mostly used for ambience recordings, taping live shows from the audience etc. The stereo thing was just an example of how european radio typically has a higher standard from a technical standpoint.
Reading the original post, I realize what that person was looking for, was probably lavalier mics that you clip unto someones shirt etc. If you're doing an interview and you want to be able to cut in on the other person talking, or just don't want to shuffle the mic back and forth, those are actually really good. I wish I had a pair but I can't afford them at the moment.
To conclude, I think mics are one of the things one should think about carefully before dropping any money. We're all n00bs in the beginning, but it's so much better to buy gear that you can keep indefinitely instead of getting something and selling it a year later. I've done that too but I wish I hadn't. The mics I have now are quite costly but I bought mine used for half the price of new and they're still holding up years later. Probably will till I retire. Plus, just knowing that your stuff is high quality gives you a level of confidence that is very important when you're working under stress and/or pressure, which you often are.
Hope that helps.