For sure dude I don't doubt it one bit but for the price point and a 4x4 space I think these will produce good enough results for me, based on the kind of results Viceman and others are seeing.
For my budget it was either these or 9x Citi clu048 1212 80cri's, I think both would probably produce pretty similar results but this setup was slightly cheaper and would take up a lot less space in the tent, be substantially lighter and hopefully generate less heat.
Which will be an issue for me in the summer, for that reason LED was the logical choice for me, then it just came down to getting the most for my money.
I originally decided on cobs but after learning more about QB's, from what I understand there's is slightly more uniformity in par over the grow area and less prone to hotspots etc., so any small advantages for a cheaper price made these a no brainer for me.
I think for those of us on a budget that have a genuine need for LED, these are a perfect starting point