Anyone had experience with Nikotel, Talqer, Voicepulse or Axvoice providers

Hi,

Anyone had experience with Nikotel, Talqer, Voiceplus or Axvoice providers? Anyone used Nikotel whitelabel or reseller service? How good is the call quality, support, uptime?

Thanks

I have used voicepulse for about a year and have been pleased.