United 100 is CBU from china and united imported only 500 M/c in first lot.....
this is a clone bike of BAJAJ PLATINA of india.
may be indian engine is good which i have not drove, but Lifan100 cc is noot good in performance.
Century is also a failed model...... please consult any market mechainc who knows about it for your satisfaction.
Basically united100cc and super power70cc deluxe were launched for show off that they are doing RnD or product developement. but actually they are selling and poromoting only regular models.
may be lifan is good for 125cc and above but but not sure for 100cc.