You can use google authenticator as a second factor for lastpass, that's what I do. Install the free app, hook it up to your account, bam, hugely more secure.
And you can get lastpass to remember certain devices, so you don't have to keep authenticating on your home laptop, for example (and you can always go to the site and revoke access to that machine if it ever gets lost).
I have had my W530 for a few months and it is the best laptop experience I have ever had. The power brick is a beast, the only downside. I use the NVidia card in dedicated mode (Optimus disabled) and would recommend the T530 for someone wanting to use integrated Intel graphics. I use it as a desktop replacement, with a Samsung 830 (which is rock solid) in the main drive slot and the original 320GB 7200RPM drive in a media bay HDD adapter.
I haven't upgraded from 16GB to 32GB yet, but I like having the option!
The main downside, besides the weight, is the 170W monstrosity of a power brick. The performance is amazing and Ubuntu support is decent: NVIDIA Optimus doesn't seem to work and suspend is flaky, but those are the only problems I've encountered.