In my opinion there not worth a hell of a lot at all, iv had 2 pairs and there neerly imposable to get jets/gaskets/rebuild kits for compaired to Webber and Dellortos, and when you do find them there expensive! I was quoted $45
for a rebuild kit for 1 of my dells, compared to $110 for the solex kit IF they could get it in.
but hey thats just my 2c