Antec is good. but I put them in the same category as coolermaster. antec usually gets other companies to build their PSUs as well like corsair does with seasonic. In fact some antecs ARE Seasonics. But some aren't. I think my biggest issue with Antec right now is I'm pissed with them about some of their designs for cases. They're incredibly sturdy and have great airflow, but they have very limited internal space and are poorly thought out.
Additionally their features at the price points offered are laughable. like their 900 series cases which people swear by are a joke imo. The switches to alter the speed of the fans are inside of the case, meaning you have to remove the side panel and reach inside of the computer to adjust fan speed and they actually claim this is a feature. There's other stuff too, like how the huge 1200 full tower size case is actually only a very large mid tower or how the removeable and washable air filters require you pull out the HDD chasis which means removing 16-24 thumbscrews after taking the case apart, but I'm not going to rant.
Point is I'm not a big fan of the company right now. Some of their PSUs are solid, but the only ones I've read anything really good about recently are their earthwatts models. In addition I've seen a lot of antecs that use multiple rails, which I avoid. Overall I have nothing bad to say about the PSUs, I just don't have anything particularly good to say either. Meanwhile seasonic/corsairs are known to be able to take more than they're specified for. Not saying I would suggest it, but they're quite robust and quiet.
