I havnt noticed any negative effects on the printer, I have about 10 spools in various colours from numerious suppliers.
layer bonding is fine, I have actually had more problems with the colorfab PLA/PHA than the ebay stuff…lol (These I have resolved now.)
The one thing I have noted about the cheap stuff is that some spools come on a small center bore meaning the filament is very tightly wound towards the end. this has caused a few grinding issues, but I have now adjusted the Bowden extruder so don’t get this anymore.
I also always do initial test prints of my object to check how well it prints, i would say that prints mostly fail because of poor setup of the model when slicing, wrong orientation, trying to print with thick layer heights (0.2mm or greater) with a high feed (say 70mm/sec or greater),
Mostly I print at 0.1 layer heights (unless it a bed filler then I go up to 0.15mm) I print at 60mm/sec this I find is the best balance for speed and layer height.
I had very bad experience from Chinese made ABS. The suppliers were selling it without saying were it was from (someone was even suggesting that it was made in USA even thought the data sheet in his website was in Chinese). Bubbles when printing and nozzle blockages were common. I had to through in the bin a reel because it was blocking the nose every 10 meters. Since then I buy quality ABS made in Europe from E3D. 2 months now not a single problem.
PLA (Felix printers PLA) and ABS (Verbatim) usually in white. I think white PLA is picked the most because it is the first option on my hub and clients that don’t have experience and a lot of information just don’t change or bother with the material. Verbatim, Felix and reprapworld (Real Dutch filament brand) have been reliable filaments when printing for clients.