I have had several of the pump type, plug-in espresso machines over the last 20 years, including two $400+ Gaggias and half a dozen Krups. The last time my Gaggia Baby Millenium was down for repairs, a neighbor loaned me his Bialetti Moka 6-cup. That was two years ago and I'm still using it.
On the plus side: The Moka has no moving parts to break, heating elements or thermal switches to wear out or inaccessible nooks and crannies to keep free of mineral deposits. The brew from the Moka has the same kick from behind as espresso, without the top-end jitters and stomach upset I associate with "coffee".
Drawback: It does take a few minutes on the stovetop between putting water and fine-grind espresso in and pouring the finished product out. If I wander off and forget to come back to the kitchen in time, the rubber gasket has to be replaced, or the Moka will spit steam out the side the next time I use it. In two years, this has only cost me around $6 total, since gaskets come in multi-packs. (I've also found that I can re-use gaskets by washing them, letting them rest in a drawer for a month or two and then flipping them over to the side without the groove melted into the rubber.)
If you adore the ritual of grinding, tamping and pulling your espresso, pride yourself on being able to name the varietals used in a blend on taste alone and insist espresso must have crema, go buy a Gaggia. For those of us who can't start our day without espresso (not coffee), freak out when the espresso machine breaks and are tired of being slaves to a descaling schedule, this is a great little espresso maker!