Didn't Kyle compare the weights from 19" rota grid drifts and rays, and confirm that the rotas were only minimally heavier?
In either case, rays plus spacers (to get the wider stance) must be similar weights to those rotas and would therefore cause the same extra strain on wheel bearings.
Considering how awesome rota grid drifts look, they're definitely worth it in my opinion!
Anyway back on topic for more pictures of 40 profiles??