At the risk of being flamed/upsetting folks, I'll offer a few words.
Are the Planet X / On Ones decent frames? Mostly yes. Let's face it, there are few "bad" frames out there these days. They appear to be well designed and, as this thread shows, lots of folk are very happy with them. However, they are definitely produced, and delivered, within a budget constraint in order to meet the price-point that PX/OO have gone for. This forum has many threads regarding QC problems; paint finishes, dropouts that didn't fit, chainguides and brake mounts incorrectly fitted, chainsuck, baggy seat tubes etc. If you buy in the knowledge that you might experience some of these problems and are happy to pay the PX/OO price then all is good.
I don't think you can cast doubt on brants abilities as a designer and when he headed off to become Shedfire and started designing the Ragleys I wondered if he would do some design work for other brands too - perhaps where he would be less cost-contrained. However, it looks like he is more-or-less a PX/OO employee again. Perhaps PX/OO could even offer a "Lexus" range that got a bit more attention at the build and QC stage to sort out some of those problems? Mind you that would require a re-think in the area of customer service too. I am not the only one to have had problems with their CS. I'm not sure if it's lies (as has been suggested above), incompetence (perhaps the staff are a bit stretched) or just laziness but that's the reason I would never buy another OO product.
And before anyone wants to have a dog at my "bitchiness", a search through STW would show many posts where I've recommended folk look at On One products.