Load Balancing with big speed differences

[DCLR]

I'm working on a new installation of OPNsense where I have two WANs. The main WAN is gigabit+ cable, the secondary is VDSL at 25-30Mbps down. In my previous installation, I had these two set up with simple failover/failback (the only option on that router; I was told that the two sources at such different speeds wouldn't work).

The docs for OPNsource suggest that different speeds can be used in load balancing, but would two sources so far apart in speed be practical? I'd love to be able to use the bandwidth on the backup source. In the old install it mostly just sat there waiting for the cable modem to go down.

Is this worth trying?

Thanks!

D.