tekops

nexVortex has been an outstanding vendor for us.  We are a technology integrator and an international re-seller of business communications solutions, a large piece of which is VoIP.  There is no reason to not deploy VoIP within a business because you control the network (which is the principle factor in call quality).  We have an extensive background in telecom with 5E and transport techs on staff.  We are the definitive source for AVAYA PBX configurations (even for Avaya) so we understand the landscape and how reliable the PSTN is and why.
But, when it came time to take the next step, eliminate traditional TDM and POTS in our business we talked to all of our customers and tried a number of vendors.  We were the most impressed with nexVortex.  It took longer to set up initially because of the vetting process but their call quality is outstanding.  We run technical forums for VoIP vendors around the world and so we get to see what everybody is dealing with (good phone systems, good phone companies, bad phone systems or technologies and bad phone companies).
We use and continue to recommend nexVortex because:

• their call quality is outstanding
• their rates are reasonable for business
• they followup and they work with us to find solutions
• they are reliable
• their estimates are reliable (turnup time, costs, etc.)
• their phone-bills are ACCURATE
• they work with every PBX solution we have tried, and most importantly,
• they pay their resellers on time.

We are a direct reseller for the number one carrier in the world and we use and recommend nexVortex because it's one piece of our business we don't have to worry about or manage.  Traditional carriers could learn a lot from them. 
We use what we sell.  We sell what we use.  If it doesn't work, and work well, we don't recommend or use it.