When
You want to know what users think
Then
Compare dated, independent firsthand accounts.
A single person's experience may be genuine but still unrepresentative. Look for specific tasks and recurring observations rather than averaging unsupported praise.
When
You need to know whether it fits your task
Then
Test a representative workflow yourself.
A repeatable example can answer a narrower question about your needs, although one successful result cannot establish overall reliability.
When
You cannot establish the source or date
Then
Leave the claim unconfirmed.
An unattributed statement cannot establish who used Runable, which version they saw, or whether their conclusion still applies.