If you want your websites to run fast, then yes. David007 above basically covers all the advantages: faster, more reliable and longer-lasting. The only drawback is the price! Hosting that offer this might cost more but we've found it really worth it…
Most hosting comes with in-built security but you should always check! I've been working with Rocket.net, who offer security with their WordPress installs (and an SSL certificate for when you're handling customer payment details).
Netherlands
