I designed, produced, and retailed universal solid state IVRs for 8 years before selling out to those who wanted my product to disappear from the marketplaces. No regrets though.
Real Time Engineering likely still offers a nice unit today but it won't be as cheap as the Chinesse offerings we find out there. Do we get what we pay for? I wont know until mine fails. I don't expect that to happen but if/when, I will opt for the RTE offering. Good luck