Personally I'm a bit on one and a bit on other side when it comes to hotboxes. They are definitely worse then preparing skis "traditional" way (with 15, 20 wax cycles and with traditional iron). But when you are serviceman and you have 30, 40, 50 pairs of skis to prepare, hotbox is like gift from heaven. Back in my WC days, I had one of first ones on market (race market not open public market), and it was expensive like hell. I'm sure its quality was way below today's standards, but even then it was huge time saver. They don't really "ruin skis", but you have much more control over all this with iron in your hands, then with skis inside of hotbox.
Now what wax... I saw until now already, that most people around here think, fluoro waxes are bad for skis. In reality this is not true. I have been using high fluoro waxes (of course not powders or blocks like Toko Streamline) for pretty much everything.... from new ski preparations to transport wax. You really want to have as much fluoro in base as possible. But this was World cup racing, not Sunday racing or even free skiing. Nowadays, when I need to prepare skis just for my own skiing (just fun without any competition), I never use fluoro anymore. It's easier and much healthier to work with non fluoro waxes, and on top of that, they are A LOT cheaper then fluoro waxes. And for me it really doesn't matter if ski is a bit slower. But if you are racing, and you can afford spending money for high fluoro waxes used as preparation or transport wax, then HFs are definitely way to go.