We've looked at a variety of providers, but are currently using LastPass within IT and are looking at rolling out further.
FYI, LastPass recently had a major security hole exposed, which has since been passed and doesn't appear to have been actively utilized by nefarious forces...but still, not ideal.
IMHO, any system is going to have weaknesses. We are looking for rare weaknesses, quick and proactive patching, and open disclosures of weaknesses and remediation taken...which thus far it seems LastPass is doing...
I also was not happy about the LogMeIn acquisition at the get-go, but thus far it seems to be going okay...so here's hoping.