I can only echo what Kate has already said.
I've handled or dealt with P.metallica, miranda, ornata, fasciata, rufilata, subfusca, regalis and striata.
Not seen an ounce of aggression or defensiveness from any of them - just a tendancy to run away and/or hide. Another nifty trick I found for photographing them - if you put them on a piece of cork bark/tile they very rarely leave it - instead they just run around the bark stopping every now and again, which is how I got this pic:
Poecilotheria are easily spooked - ie if you open the tank and shove your hand in then that's when it's likely to give you a nip - most of the time this seems to be mistaking your hand for a prey item rather than a defensive bite. As long as they have somewhere to run they'll be fine.
Speed wise, the only one I've found to be rocket-ship fast is the baby rufilata. The others are all pretty manageable, you just need to have your wits about you. Don't get me wrong though, they will easily quadruple the pace of almost any terrestrial spiders.
I keep 4 Pokes with more on the way, and I wouldn't get rid of them for the world.
