I've owned and currently use a Thermaltake Toughpower XT 875W for 11 years and its still working without ever failing me - albeit of course I gotta replace it because its aging lol.
See amazon for customer reviews, and then make sure to set the filter to the specific model of the PSU that you want to view (Because by default, amazon shows reviews from All models which can get confusing). I would buy this exact same model of PSU if i ever had the chance again, because its proven itself to me for over a decade and counting but sadly supply issues of Covid made it otherwise.
There are definitely some models that are bad within Thermal take's brand, and it is likewise the case for all other PSU manufacturers. Probably either because the manufacturer did a bad design or they outsourced the production or some of its components to another company that doesn't have good standards. If you've ever heard, Corsair had even "outsourced" the production of their PSUs by a Chinese company called "Great Wall" which has made the Corsair CX500, TX850, CX450, CS550M models, Reotoro Enigma 850W, OCZ ZX 1000W
Source:
View: https://www.youtube.com/watch?v=WwBnkRN9miA
(Jump to 2:20 time mark)
I usually check in Amazon for reviews and Newegg reviews combined. If the product has no review yet, I would dodge it. If it has 1-3 people (or more) complaining about it killed all their PC components (worst case scenario), I would also dodge it. For me it really boils down to a per model basis, but its also equally keen to know the insides of the PSU and what materials were used in the building of the PSU, as well as its performance when load tests are done. If there is someone who can testify that he's still running the PSU for at least a decade old without issues then it would be a plus to me.
Here are some websites that tests PSUs:
TweakTown has the most authoritative, unbiased technology, science, space, and gaming news and reviews. Trusted in North America and globally since 1999.
www.tweaktown.com
KitGuru.net - Tech News | Hardware News | Hardware Reviews | IOS | Mobile | Gaming | Graphics Cards
www.kitguru.net
AC ripple minimization is also another parameter to consider. Corsair i think has a minimum target of 20mV of AC Ripple. The lower, the better. AC Ripple that's high as 120mV can kill components.
Also consider googling if there will be any hardware issues with your desired PSU (it seldom happens, but the chance is there). It usually happens with GPUs because they often draw the most power from the PSU, especially if you're using high end GPUs. Some people forget this step but nevertheless, could have been avoided through additional research.
Only time will tell when it comes to PSU longevity, as well as all the other factors that can affect it.
Also I wouldn't buy a PSU just because it has RGB. You might be paying for that instead of the PSU's quality itself