Help me,please!Thank you

Help me,please!Thank you
Which help to check reference from those company.
Objective criteria of question may require:
1.what have bought
2.when did it buy
3.rate of after sales comment,e.g.rate 1 (the lowest) and 10 (full score)
4.rate of hardware durability,rating method same as above
5.if they are going to buy a new machine due to expansion,we they stick on buying from them without any hesitation.If not,why.