I'm in the market for a new laptop.  I've read quite a few posts on the forum about laptops.  Most seem to gravitate towards Dell.  While that's a distinct possibility (I'm looking at the M4800), I'm wondering if anyone has anything to say about either the HP Zbook 15 or the Lenovo M540.  I'm not necessarily talking about specs here, although that would be welcome.  I'm wondering more about value, quality, durability, and usability.  Anybody have first-hand knowledge they could share?  If you can share things about specific specs and performance that would be a plus.  Feedback about Dell is also welcome.