RG1215 reg question

I just picked up this reg from an authorise dive rite dealer and plan on using it as my backup second stage on my doubles
for tech diving.between 130 and 200ft. however on the diverite oficial site it says that "spring balance regulators should not be used below 130ft." so Im worried since this reg is spring balance not pneumatically balance .however the dealer said hes breathed at tech depth with no problem . has anyone use this reg below 130ft . Im stuck with it anyways.
thanks!

The RG1215 was designed for use as an Octopus; as such it is going to have a fair bit of breathing resistance. The RG2010 would have been a far better choice for a stage reg.

Jerry