ive had a 250g perfecto for 2 years now, and the guy i bought it from said he had it for atleast 5 years. and this has been a pacu tank since it was made, first black pacu from the original, and now my red bellies.
*knock on wood* its held up to the abuse of a total of 8 pacu so far through its life, and the only thing wrong is the top wood trim is coming off since its 4 pieces, not 1 whole. so id say its doing pretty good
i will add, that the glass seems to have a greenish tint to it, which ive heard others complain about also with large perfecto tanks. i know my water is clear as can be, yet the tank makes it seem otherwise slightly.