I have used and deployed the ttgo lora boards. The boards are a bit cramped, soldering the headers requires you to remove the screen in order not to melt the ribbon cable (w I didnt try). But they work. Zero problems in the field but two out if 20~ died on my bench while just coding/out of nowhere. Furthermore, IIRC, the default i2c pins used in many libraries are used for lora/oled so you need to define two custom pins using TwoWire for example.