Hehe, now that Tuna is in his night time...
I just can not see Tuna making a rant. Tuna does not do rants, and that's a fact.
I know that Tlog (telemetry log) has been around quite a while, which fact alone does not make it good or useful. I just want to point out a few things about the 520. (Tuna is right about Tlog, but I think we do not need it.)
First, the 520 does not save telemetry logs unless you turn that option on. Here's why saving them may not be necessary or truly useful.
During the 520 flights, there is a constant display of pertinent information which you can examine at any time by tapping an icon. Remember that a screen capture will save this info at anytime during the flight.
In addition, the 520 internally analyzes GPS, compass, accelerometer, and other subsystems and informs of malfunctions or need for re-calibrations. The Typhoon H has no such abilities, or only primitive ones.
The 520 GPS positioning is accurate to within inches. The Typhoon H is not. The 520 barometric height function is extremely accurate. The Typhoon H is notably rarely correct. You can land the 520 like a feather, literally on a dime, or it can land autonomously and shut itself off.
The camera settings, separate for pics and videos, are remembered. Switch between videos and stills with a button click in flight.
Yes, the H520 looks like the a repainted TH, the ST16s looks like the ST16, but they are radically different craft systems.
The H520 may look expensive, but you get sophisticated autonomous flight mapping software that you own and do not have to pay monthly fees to use.