There are plenty out there and no significant level of compatibility complaints.
For a long time, I ran an ECI modem on a Huawei cabinet (opposite pairing to you) and, prior to G.INP, I would see about 1-2 Mbps extra although I moved back to the HG612 mainly because of access to stats.
Just install it and leave it in place for a week to see how it performs ... you may get a little more or a little less, I doubt if there will be a real significant change.
M H C
taurus excreta cerebrum vincit