Hm, Montague's were work horse rods - usually not real high quality - but occasionally they hunkered down and made some really fancy, real high quality stuff. They're generally on the low end of the spectrum of cane rods - would most definitely fish it, as that's what it was meant for. I'll bet that rod is more of a 6/7 than a 5/6. Try out a double taper #6 if you've got one handy. Not sure how your casting style is - but cane rods usually require a slower casting stroke than graphite, so if you're used to fishing stiff(er) graphite stuff, it can be a little bit of adjustment - but it sounds like you're already doing well with that rod.
And yeah - cane rods are a lot heavier than modern graphite stuff, and heavier than even modern fiberglass. Some people don't like the heft of a cane rod, some do. Got to remember - cane rods are made from woody strips of tall grass, then glued together. They're solid all the way through - graphite/glass rods are hollow tubes with thin walls.
Sounds like you got a decent new fishin rod, I envy you
