The 200 and 600w versions have issues that BRS is looking into. The 100 and 300w versions have a very, very low failure rate.
I've got 5 BRS heaters running (all 300 or 100w) and not a single failure in over 2 years.
Most recent reviews would indicate the 300W version being problematic while probably most popular at the same time...but thats just speculation.
Would love to hear from @Bulk Reef Supply should they choose to address this.