It seems that Valentine Research is quite selective in choosing which e-mails they respond to.
Yesterday, I e-mailed Valentine inquiring about upgrading my 3.813 to the newest version 3.858. In my e-mail I acknowledged that I "would" happily pay for the upgrade. Surprisingly...I have yet to receive a response.
Just a few moments ago, I e-mailed a different e-mail to Valentine. This time I indicated interest in purchasing a new unit. Low and behold...I received an immediate response from Valentine. Length of time for their response = 4 minutes.
Just found the whole scenario very interesting...