Power con cables are easy to get. It has been a standard in the audio industry for a long time. I have used them for years and never had one fail on me. Yankee parades, giant parades, inaugurations, etc, never an issue. Also, not sure why people think this is not readily available, it absolutely is from the major music stores.
As working musicians, we should always carry spares of everything (tubes, strings, cables, etc), so I really don't understand the concern. Power con cables are readily available in music stores just as IEC cables.
Not to stray from the topic but a point about using any old IEC cable... Just because you may be able to obtain an IEC cable from the computer of the club you may be gigging at doesn't necessarily mean it is the right cable for your equipment. Many IEC cables are manufactured in very light gauges such as 18g, which really isn't sufficient for your high powered amps. When using a light gauge power cable for an amp which draws a lot of power, you are doing a disservice to your tone and quite frankly risking a potential problem happening to your amp. Have you ever seen the IEC cable for the old crown 2402's? They are a thick gauge (I think 12g).
My point is that the manufacturer pairs a power cable for their equipment because it has been tested and rated to give you the best possible performance and reliability.... So you just can't use any power cable safely. And if Jule can get better performance from a cable using a power con connector, well the answer seems like a no brainer, especially since we are all on the never ending quest for the holy grail of tone. Lol!
I have a Glock Blue Soul and I purchased the upgraded thicker gauge IEC cable for it. I can tell you it makes a difference. I have better low end and quicker response from the amp, and there seems to be better clarity and performance as well, as opposed to using any old IEC cable. With that being said, my Glock cable sometimes wiggles lose. I had to put a layer of gaff tape around it to make it a tighter fit. I would much rather have had a power con connector which locks in so I wouldn't have to worry about my singer climbing behind my amp and knocking the power cable out.
I'm no electrical engineer so I leave those decisions to the pros. So Jule, if you think the power con provides more reliability and performance, we'll then, sign me up.