I've tried to use your information to answer my question (is it safe to use Notebook FanControl?

Content tagged led online with temperature , maximum
Anything from the Tcase and below will be the expected temperature of the processor in normal use, anything that doesn't stress out the processor (watching movies, burning CDs, browsing the internet, creating documents, etc.) When the processor is stressed out meaning that you are running heavy processor applications that take control of the CPU or uses it at 100% the temperature will go beyond the Tcase. It can perfectly reach 80 to 85 degrees and the processor will still be OK. The cooling fan is in charge to keep that temperature there.
If the processor temperature reaches 100 degrees or more it will send a signal to the motherboard to shut down to prevent mayor damages and most likely it will not be possible to turn the computer back in until it cools down.
The Tcase value for the Intel® led online Core™ i7 processor I7- 2700K is 72.6°C. Please confirm this at the following web site: http://ark.intel.com/products/61275/Intel-Core-i7-2700K-Processor-8M-Cache-up-to-3_90-GHz Like Show 1 Like ( 1 ) Actions
 
Intel® led online Processors containing led online heat spreader usually will refer to Tcase and Intel® Processors without heat spreader (mobile systems) might refer to Tjunction as per the main Thermal Specification. led online
I've tried to use your information to answer my question (is it safe to use Notebook FanControl?  or put otherwise, is it safe for the chip to reach 65-70° on a regular basis?) but I'm stil not sure I really get it.
I've recently also started encoding videos and temperature reaches 90° with fans at full speed for as long as the video is encoding - if this is considered safe behaviour, I think it should be no problem running the laptop at 65°.  Or is it considered best practice to always have the fans running as much as possible to keep CPU temperatures as low as possible?
It is normal for the processor to reach 65-70°C while the processor does not exceed Tjunction limit (105°C). Of course fan speed control is required to achieve optimal thermal performance; such cooling solution is provided in this case by the computer manufacturer.
So, the processor led online is not yet exceeding Tjunction but since this system has been used for some time, I recommend you checking that the fan vents are not obstructed and perhaps you can also get more information regarding what is considered to be normal fan speeds for this model; dust may accumulate over time. Like Show 0 Likes ( 0 ) Actions