Since the UNisolar 68 watt amorphorus panels are no longer made, and are very different from the Panels shown in the OP, I do not think we should be making longevity comparisons to the flex panels shown in the OP's AM solar link to the butyl backed amorphorus panels.
Looks like there are some 136 watt Unisolar versions still in stock by some retailers, but these are some 15 feet long IIRC.
https://www.ebay.com/i/123242872309?chn=ps
I recall seeing the same 68 watt panels with a different labelling for a short while too.
I knew at the time when i bought my Unisolar pvl-68 that there was a limited supply of them as they had just filed for bankruptcy. the purchase was made with some urgency in mind, as I had 16 inches wide and 9'6 available for it.
Turns out there was also an E-pvl-68 and these had MC4 connectors where my pvl-68 came with MC3.
The Unisolar specs said to not roll them up in less than a certain diameter, but the box mine was shipped in was a few inches under this minimum diameter. I could really have used another pair of hands when peeling off the paper backing and sticking mine to my roof. To say the immediate area was filled with sailor's curses and little bits of paper that did not freak out anybody within hearing distance would be....inaccurate. It was so much worse than that.
I currently have this flex panel:
https://www.wholesalesolar.com/9433670/s...olar-panel
Thanks to the members of this forum and the renogy gift certificate provided me. I 'think' it is likely significantly higher quality that the failed flex panels shown in the Am solar anti flex panel link.
But this is conjecture
My UNisolar pvl-68 is this panel:
https://www.google.com/search?q=UNisolar+pvl-68&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjznLntj4rdAhWhllQKHWv0APMQ_AUICygC&biw=1422&bih=747
When first installed, it exceeded its rating by a good amount.
If My unisolar failed and I were to remove it then the sunpower Flex panel would be easier to mount.
My 198 watts, 130 Kyocera framed and unisolar pvl68 in parallel, will get me close to 12 amps in summer near noon.
Love to have 17.5 amps.