I have a Vortex SPARC on one of my ARs.  After a few years of me fat fingering the battery compartment - I stripped it out to the point that I couldn't seat the battery successfully...  They tote a VIP warranty, no questions asked - so I sent it in for service.  Mailed it out last Friday.  I received confirmation that they received it Monday.  Then another e-mail with a tracking number that it shipped out Wednesday!  I got it via FedEx today!  They replaced the battery compartment and tested it and sent it back (with a new battery...)  one week turn around with no charge - I'm pretty happy with Vortex Optics customer service!

Vortex is great, I've used their strikefire and sparc models and I was completely happy with both, I have since upgraded to an eotech, but nothing surpasses their customer service.  I will be buying a viper PST to put on my 300 win mag when I get the cash for it.

the best in the business.  unless i see a screaming deal on something else, all of my newly purchased optics will be vortex