I put my system together 1.5-2 years ago. At that time, the element enclosures were still in their infancy, as were SS ULWD ripple elements. Pricing both configurations at that time, I recall it wasn't that much of a delta (factoring NEMA 8/3 and 30 A cord caps). That being said, I am commenting to the performance/reliability of the BoilCoil in a kettle configuration.
I probably have 25-30 10 gal brewing sessions on the system, with BoilCoil in the HLT & BK. In that time I have dry-fired the HLT element twice during the sparge. The boil is over the whole circumference of the keggle, which creates a rolling convection up the sides and back down the center. I also questioned the ULWD, and as a test (please don't try this at home) I fired the coil at 100% during a test heat cycle and reached in and touched the coil. I could put my palm on the coil for about 4-5 secs before it became uncomfortable.
Speaking to reliability, I personally don't have enough brewing hours to give it the stamp of approval on HBT, but a small brewery in town is using the 55 gal coils in their set up ( w/extender rings). They have been doing 15-20 barrels a week for 1.5 years, with no issues on the same coils (dual elements in HLT & BK).
For my system- Sanke/BoilCoil HLT & BK (4500w)
Typical times are:
Strike from 60-165 about 45-50 mins
Mash-out 150-168 about 15 min (via HERMs in HLT)
Boil 145-203 (hour sparse) @ 13.5 gals 15 mins
I know when I was building my setup, I struggled to find the info I was looking for at the time. I am also aware that I would not have been able to build my system without all of you brewers out there, so thank you.