The 48 port PoE models of the MS210 and MS225 are affected. The actual failure rate is very low - so low that unless you have 1,000 switches you are statistically unlikely to experience an issue (I guess switches operating in hot rooms are more likely to have an issue).
From the dashboard if you go Help/Hardware Replacements it will show if you have anything affected.
Note that if you opt for an MS250 replacement "right now" then when your current licence expires you will be probably be looking at having to buy a new MS250 licence, rather than a cheaper MS210 or MS225 licence.
If you can wait, then in due time you are likely to get your MS210/MS225 replaced with a like model switch. Note that Cisco Meraki are monitoring the switch temperatures for any that need more prompt replacement.