AM882's are being replaced with EM806's, you try and find an EM806 in China they just don't retail them in the Asian Market. The only difference I can see according to the manual is the EM806 has different firmware relating to the motors. Region specific for the US and EU markets as the motors relate to ones they offer here. Probably the same motor different part number.

EM806's for US and EU and AM882 for Asian markets at least for now seems to be the rule, the AM882 are £60, the EM806 are ~£100

I'll strip one of the AM882's and get pics would be interesting to see what's inside the EM806 and if it really is identical except for firmware.

AM882 and EM806 are solid state tech unless you're unlucky these things will last forever.

How much did you pay for your analog drivers? I paid £200 for 4 AM882's but 2 were 2nd hand it would be £240 for new.