I don't think that the EZ product is better, but it may be less expensive to purchase. I have seen many of their AAs out there on SX50s--they seem to work fine. I've also talked to a tech at the company and he seemed to know Mitel Sx50s pretty good but limited to how the Mitel worked with his product. VM is something else again, though, and I don't personally think that the EZ VM could comptete with VSR as far as features---BUT---if it's the right kind of application, the EZ product might do just fine.