Some people mistakenly think that USI is an off brand. That's far from true. The IoPHic technology, for example, is exclusive to them. I can't imagine an off-brand having an R&D team to develop an exclusive circuit and chip. If you look in the unit, you'll see an IC chip (microprocessor) developed just for this smoke detector. In fact, it has 28 pins which hints at its sophistication.
The detector even has two patents: #D627671 and #7893825.
Also, according to Patentbuddy, the manufacturer (Universal Security Instruments, Inc) owns 23 patents, so they're actually a reputable company. And the fact that they custom-designed a microprocessor just for the IoPhic technology means that they don't just file patents, but actually put them into practice. That doesn't prove, of course, that IoPhic technology is any good, although they reference an independent test showing its advantages.