I use CloudFlare, a similar type of CDN like Incapsula. It's pretty effective in thwarting basic DDoS attack, but for a more sophisticated protection, I think Incapsula is better.
But that's the best case for me. BizEpic.com is having an outage everyday for 5-10 minutes - and the cause is... huge number of login attempts from different IPs, crashing the server. Contacted my host, and it seems that the attack affected sites hosted in the same server (I use managed shared hosting, and the company is very reliable.)
