Anyone have experience servicing a Goldtec hub axle, bearings, etc?

No, so cheap that you pretty much might as well do it anyway. Look at the size marked on the seal, I think they are 6001, which you can get for about £10/pr for SKF bearings from http://simplybearings.co.uk/shop/p6183/SKF+60012RSH+Sealed+Deep+Groove+Ball+Bearing+12x28x8mm/product_info.html, obviously get two pairs and share the postage between the two hubs that you're doing the transplant operations on.

Reckon these will be of similar quality? Only £1.50 each + £1.95 shipping.

http://www.diytools.co.uk/diy/Main/sp-64-12560-122458-bearing%3a-6001-2rs-c3%3a-fag.asp