^+1 ... alloys are much better and way too stronger than spokes wheels... i hv used them in jailing for seven years, many times hit them very hard in bumps but they never bent or needed any maintenance or alignment issues ... about weight, yes they are little heavier than spokes but not much, so fuel avg will be compromised too. .. the lighter ones u talking about are not available here because they r made of exclusive metals and very expensive...
about manufacturers here not installing them... big vendors like pak suzuki and atlas will never include them in even 100 years... bhai un ka bus chalay to production cost bachanay k liay spokes ki jaga tinkay laga dain... 
a good quality chinese set would cost around 4.5k..
Sent from Mars using Mind Control