If they say MEI on them what makes you say they are Cherry switches? They don't appear to be shaped the same with the exception of the plunger.
1) The Desk Model of this same keyboard uses cherry MLs and I have no reason to believe these wouldn't use cherry switches albeit in an 'unbranded' or 'custom solution'
2) The body of the switch is remarkably similar as far as I can tell, as is the plunger.
3) I found no reference to an MEI company that manufactured switches on the internet, leading me to believe these are a 'custom solution' (SEE POINT 1 FOR FURTHER INFO)
4) an educated guess as well as having (what I feel is) the same feel as the cherry MX white switches, it has forced me to make believe that these are switches made by Cherry for
this keyboard or are just custom branded Cherry MXs.