Just got my hands on the GTC505 and wow, this thing is a game-changer! As someone who works on everything from motorcycles to marine engines, having a tool that can handle all spark-ignition systems is a dream come true.

The real-time waveform display is insanely useful for diagnosing tricky ignition issues. I love how it shows spark peak voltage and ramp time - no more guessing games with timing problems!

Build quality is top-notch. The buttons feel solid, the display is clear even in bright sunlight, and the software is surprisingly intuitive for such a powerful diagnostic tool.

Only minor gripe? The gooseneck probe connection could be tighter. But hey, that's what extension cables are for! Seriously considering getting the GTC505-CSC accessory to solve this.

Used it yesterday on a stubborn misfire in my buddy's Corvette (OptiSpark distributor - ugh!). Found the bad cylinder in minutes when traditional methods would've taken hours. That alone made this worth every penny!

If you're serious about ignition diagnostics, stop hesitating. This analyzer will pay for itself in time saved on your first few jobs!