I have a top dressage. Great saddle, however depending on how old it is ask about the tree; They are made of plastic and very difficult to adjust. I bought mine brand new in 1995 and was told two years later that the tree could not be adjusted. I have heard recently that they are more willing to adjust them, however if the tree snaps you are left with a pile of leather.
The leather is very nice and holds up very well. I have just used a clean towel with water water (no soap) to clear the dust off and then apply Bienenwachs.
As far as rding in it, I love it. It forces me to sit correctly and it is comfortable. For $600 that is a steal if it is in good shape. I paid $3,500 brand new. When my horse outgrows I will probably list it for close to 2k.
I do saddle searches quite often and come across the "Top" dressage saddles a fair amount. I'd say that in good condition anywhere up to $900 would be a good buy, with how the current market is and how many are out there.
http://dressageesquire.blogspot.com "The ability to write a check for attire should not be confused with expertise. Proficiency doesn't arrive shrink-wrapped from UPS and placed on your doorstep."
That would be a very good buy if it is in good condition. I have one that I liked "OK". It fit my horse and while it wasn't a bad saddle it wasn't the one I LOVED - I always felt I was sitting on top of the horse & saddle, not being part of the horse.
I bought a Prestige "Top" dressage saddle on eBay 2 years ago. Love it very much, comfortable twist, and I particularly like the way it holds my leg in the correct position - being an eventer, this dressage position is not natural for me!
The saddle had been recently reflocked, and the leather was in great condition when I recieved it. Paid $800 and thought I stole it at the time.
DFL - the Optimax is made for people w/a long thigh so that might explain how you feel about the flap length.
OP - the Tops are pretty much a neutral balance point saddle w/a pretty big knee block. The seat is not really deep and won't force you into position but the knee block will influence your thigh/hip flexor position. I like them but I don't like to be stuck somewhere. If you naturally position w/your seatbones pointing backwards (towards the horses tail) you might REALLY not like this saddle.
"Kindness is free" ~ Eurofoal
--- The CoTH CYA - please consult w/your veterinarian under any and all circumstances.
If it's one of the saddles from "abroad," I have experience bidding on those saddles. In the last few seconds the prices can double or triple. Or not. My advice is to be there at the end and bid the max you think it's worth to you.