I bought a set of their little brothers - Advent Laureate. The foam surround looked "OK", but was dried out and very brittle, so I got them for a very low price. They were my first re-foam job, and came out really well - easy job. My daughter loves them for her small apartment. You will probably have to replace the foam surrounds on these as well.
I did and A/B test against my Infinity Qb's, and I thought they sounded very good, nice and clear mid-range and crisp highs. In comparison, they really only lacked power at the low end, which didn't surprise me considering the size of the woofers - 10 inch on the Infinity and two 6 inch woofs on the Laureate. The Heritage with it's two 8 inch woofers should easily outperform the Laureate on the bottom end.
These aren't the quality of the original Advent speakers. Advent at the time these were made was owned by Jensen. Still, I like the design of these speakers, even if the cabinet isn't real wood. The Pecan wood fronts, tops and bottoms look nice, and the grills are quite attractive to my eye. Factor in the cost of repairs of the foam surrounds, but if you don't have to pay a lot for them I'd bet you would be very pleased to have them.