Weight is maybe 30-40% of what it would weigh in glass, guessing off the top of my head. My tank is a two person lift, your tank will be the same.
The biggest gains is:
Clarity
Strength
Can buff out fine scratches.
Cutting holes.
Obviously the downside is:
Cost
Scratches easy
Have to be careful rubbing/scraping algae and choraline algae off the side.
Invest in a Shark Magnet.
I put my overflow on the side of my tank and not through the bottom. I wanted to eliminate any chance of a bottom installed bulkhead from failing and draining my tank.
I built my stand out of 2x6's which cost me $80 and will hold a ridiculous amount of weight, maybe 3-4 times the tank weight.
I went with a fab process that takes much more time but offers almost double the PSI strength.
All this was for my Anularis Angle that I grew from 1" and is now 9"