Hi there and welcome! Granted, I have a different saw than you (I would love an Excalibur, but it may be a while yet), but I use nothing but spirals. I find people either love or hate them, and I'm on the love end. I hate turning wood, and dread having to put my hand behind the blade for anything. Like Kevin said, the tension has to be really tight, so that when you pluck it like a guitar you get a high ping, almost an F. (Instead of the middle C of a flat blade). The best advice I got was from a video, and he said if you can tap your piece next to your spiral blade and it flexes more than about 1/16", it needs to be tightened some more.
Also, yes, they have to be blown out fairly often. When I'm cutting a puzzle I stop every ten pieces or so to blow the kerf dust out. I just blow on it, but you could use an air hose instead.
And cut fairly slowly. Your wood will chatter if you're going too fast, and that will make your blade break. So will overheating, so you'll have to turn the saw off regularly and let it cool down while using a spiral, if you want it to last a little longer.
I hope that's decent advice! I'm fairly new to scrolling, those are just things I've picked up while cutting! Welcome to the Village, there is always someone around to answer questions and give advice and be friends!