Yes, monties get very long swords -- at least 1 and 1/2 to 2 times their body length. This and the round dorsal make them the choicest of sword species. The helleri based commercial swords never had swords this big as they are platy x swordtail hybrids and that shortens the sword. Wild helleri swords (like the old green sword but much nicer) do have long swords but not like monties. Monties were only imported into Europe in the mid/late 80's and then soon after into the USA. They are still little known outside of livebearer freaks. I think the nezzie swords are even cooler. But monties are the most graceful.
No, I never have done saltwater. Just never was interested except in seahorses. Way too expensive for me and so hard to breed. I love killies, wild livebearers, weird little wild betta and gourami species, discus, angels, Julidochromis, Lamprologus, dwarf cichlids, fancy long fin domestic bred livebearers and some tetras.