Almost bought one myself....(groundwater temps are in the mid 80*s in the summer)
My wort chilling experience last night, from flame out to pitch............
Flame cut at 10:11,
Temp @ 10:12 = 212*
Using my 50ft ss 3/8" wort chiller, temp @ 10:20 was 100*, 8 minutes elapsed
By 10:24, I was at 90*, 12 minutes elapsed
At 10:25, I dunked my 7.5 gallon brewpot into an ice bath with 3 X 10lbs of ice & water
By 10:37 I was at 65*, my personal ideal pitching temp
Could've pitched a tad earlier, but it was covered, sterile, and I was distracted by something else for a minute or two...
Point is, with groundwater temps about 20* higher than my pitch temp, I'm pretty pleased with getting it pitched 26-27 minutes after I cut the fire off. I don't have a fancy boil kettle, no valves or spigots. I do it 'old school' by stirring and swirling with a ss spoon and the actual chiller to keep the wort moving, continually getting hot and cold mixing.
Still kinda want a pre-chiller though.....