Unfortunately, my last few models uploaded to shapeways were too hollowed out and the skin too thin. Me trying to be cheap. Anyway, they couldn't be printed, which meant I missed my pouring window and lost momentum. As soon as I get about 400 other things out the way, I'll remodel my sculptures and get them ready for casting. Don't hold your breath, sorry.
As for Transparent Detail, I think that's a UV cured epoxy, so probably less amenable to burn out than the thermally fused WSF. Though a hot enough kiln (1000'C) will burn out most things, except clay and metals etc. Again: outdoor kiln only. You don't want to be breathing plastic fumes.
My feeling after my attempts is that, if the price continues to fall and your model is suitable, getting it directly metal printed by shapeways is probably time and cost effecting over pouring a bronze from a WSF model, unless you do metal pouring as a hobby and are set up for it already. Even then, shapeways looks very attractive, considering all the finishing work you avoid.
Digression: The pic here is my 3 hand built wax sculptures ready for investment tomorrow then burn out and casting next week. All the red wax is to get the bronze in and the air out. You have to grind all that off at the end. Plus you have to buy extra bronze to account for it. Typically 2x again as much as the model actually needs. Worth it for bigger stuff, but direct printing is better for small objects.