@Acepak1 we have replaced about 20x WS-C3850-48P and -24P with MS355-48X and 24X so far and it has generally gone very well. In most ways they are an upgrade and you could consider a lesser switch such as an MS250 if you don't want mGig or QSFP+ ports. As we wanted both the MS355s were a no-brainer. Do be aware that you cannot run the same level of access lists on the MS switches as you can on the Catalyst models that you are replacing.
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