[Ulsmak]

I use the Powermax 100 Amp Power Supply without issue for almost two years. They are about $180 USD.

[Jack79]

I use HP server power supply modified to gane 14,00V. with this voltage it got about 80A. I used for one year. Never had problem. Cost 30 euro.

[m_fife]

I've used a NOCO Genius 10 multiple times without issue. Granted the draw probably pulls from the battery as it is only 10a.

[jaki]

70A would be fine for most vehicles. It really is vehicle dependent though. A highly optioned vehicle will easily hit 40-50A at the beginning of the flashing process. I've found they usually settle down to around 25-30A steady. Like most tools though, if you do this professionally it's much cheaper to buy the best tool versus replacing a bricked module. I use the Clore Automotive PL6100 (100A). Expensive but well worth the peace of mind. The airpress 77108 looks like a nice unit though for the money.

Excatly, I allways start flashing process to connect PS to car and then take a cup of coffee and start to wire ethernet & laptop up. If battery is ok, usually it drops to what You said 20 - 30A and stays there.
i have flashed dozens of E- to G series and never had issues with 50A supply.
If battery is bad it can stay to 50A forever.
Of course, headlights, seat heating off, blower to minuum etc, all the time.

[nBlacky]

I use this one https://www.ebay.de/itm/166119364046 bought it years ago for 150€ or something like that.