Why I won't buy another Quark

I was digging through my old solar captures and I came across this capture taken in 2016 with a Quark that was a replacement for another Quark. The detail around the spot is fantastic, better than I could expect, but there is a lot of smearing that runs through the centre and for me it makes the device unusable for imaging, unfortunately. For me this image captures perfectly why I personally would be tempted to, but wouldn't, buy another Quark. I could buy a Quark from an excellent company like First Light Optics and return it if unhappy. But what if I keep it and it later develops a fault and I am sent a replacement that looks like this one? It could go back again. Another few weeks lost. And what if the replacement for the replacement is even worse? First Light Optics currently have this model at £999. That may be cheap for solar h-alpha, but it is still a lot of money for many of my fellow astronomers. One wonders how such a unit ends up in a customer's hands, and it's doubly disappointing to get this as a replacement. This image serves as a reminder to myself, as tempting as it is, to never buy a Quark again. If my budget only stretches to a PST or Lunt 50, that will be just fine, I have been very impressed by my views through PSTs and Lunts over the years. --- 2016 Equinox 120, Daystar Quark