I digress to disagree that quality and brand name go hand in hand. This is the common misconception that American elitists want you to believe
I will grant this post with credit for making some clearly true statements, but:
When one invests time in making such a long response, it is best to avoid 'fighting words'. They paint you as a fool. Second, avoid run-on sentences. Third, separate your ideas in paragraphs. Finally, with your profile (country Uganda, state Colorado, occupation Making Money... ), it impossible to be considered a trustworthy opinion while hiding in the shadows of anonymity.
ON the subject:
I have VFDs on most of my active machinery, including, but not limited to Allen-Bradley 1305's, 1336 and 1336S VFDs, a couple of KB's, and an Omron.
I bought the KBs new, and they work fine for smaller machines. One of the KBs is a DC drive, and it's down right snappy quick. The VFDs... they're okay... As others said, the HMI programming is done with same screwdriver you connected the wiring, which is pleasant in it's own right.
The REST of my drives... on my lathes, my BP, my radial drill, even my 3hp 3ph electrically-driven power trowel... are one of the old A-B units. They all came to me second-hand, all running the original capacitors, all being fed single phase.
I'm probably an 'eliteist', and my shop is a 'personal', not commercial business venture- my budget is entirely avocation-grade, but I use these tools to develop solutions for my occupation, and while they don't run 24/7/365, and aren't an uptime-critical thing, I do NOT like to be fixing things each time an electrical storm passes through... and fortunately (knock knock) I have yet to have any problems with ANY of it.
But I see lots of cheap junk elsewhere, and I'm unfortunately stuck being the guy that has to fix it, so I don't buy it.