I will get right to the point, the tangent 500 is a terible speaker, I am not sure why. The driver are basically the same as a Heresy II except for the addition of the passive radiator.
I was able to A-B my pair against both the Forte and the Forte II, both were far superior to the Tangent, so now my Tangents are just spare parts.
If you could get a killer deal on them, say $200.00 or less, they may be worth looking into, possibly crossover mods would bring them in line.