Small sample size from anecdotal evidence. Just because you haven't had any problems doesn't mean there aren't any common problems or that P4U doesn't hit or miss with their mods. This is admitted from even P4U fans I've come across. Or just because all your DNAs have failed doesn't mean that's a common problem (it depends from manufacturer to manufacturer, HCigar are known for their notoriously bad soldering jobs in some of their models). DNA mods also have a better reputation and a couple different avenues to try and get warranty work done on it--from the manufacturer directly or from Evolv if it's board related. I'm trying to look at the big picture, not just my own personal experience with devices but from all the data I've come across on forums and reddit.
I have only ever had one P4U mod (IPVd3) and I had to return it the same day I received it due to a faulty 510. Received it, screwed an atty on it, worked for about 3 drags, then started reading my resistance wrong no matter what atty it was, the atty's read fine on other mods. I don't hold it against that particular model or P4U, because most others say it's a great mod and every manufacturer will have a certain amount of defective mods that pass QC even the more expensive mod manufacturers. I'm not intending to single P4U out or any manufacturer, it's just the reality of buying electronics.. There are definitely some great P4U mods out there. IPV5 is one I have in mind, IPV8 definitely looks promising but I'm still wouldn't feel comfortable recommend it just based on how new to the market it is.
Anyway, you missed my point. My point is that budget mods are budget mods for a reason. If you're comfortable being a guinea pig, that's fine. But if you are choosing to buy a newly released device just don't be surprised if it has its faults. Hence my general rule: give new mods at least six months to get a more complete picture of a device's pros and cons.