Buy from 80 Design Store, protect your plugs and spend extra $ on quality batteries. That sounds about right. Also once you get your fine tune adjustments done, I think it's a good idea to write them down somewhere just in case you need to reset the groupset.
I probably would have stayed mechanical if it wasn't for the LTwoo price point. It does work well when working and just be ready to figure stuff out on your own. Now that the 80 Design store has stepped up on warranty service, it's definitely helped and replacement parts are also available for purchase.
Thats where I'm at, LTwoo Rx/R9 mechanical are really good value and don't seem to have many major flaws. I could spend a bit more to maybe piece together a used 105/ultegra mechanical disc group, or I could spend a similar amount and get the ERx/ER9 and get electronic goodies.
This thread is now 78 pages long, so I don't blame you for not being able or willing to scour it. Having followed along for most of it, I'll do my best to summarize. I'll also state that I don't actually own an eR9/eRX, but I do own the 1x gravel version the eGR (different thread running in the cross forum).
I've read through a good portion of it over the last week trying to come to a decision. There are large sections where the topic changes a bunch so it is hard to find the real meat and potatoes of what is good/bad. Thanks for your help.
At the end of the day, you have to be aware that you're taking some amount of risk. You can't walk into a bike shop and get a replacement charging cable, or wire harness, or new derailleur next week. In the worst case, you might get shafted with a failed unit that won't be replaced for free. In even the best case, you might have a crash and be down for weeks while you wait for a replacement part, because it all comes from China and none of it is stateside. If you're willing to deal with that, then you can likely reap significant cost savings for, hopefully, just a little risk of inconvenience. If the potential for missing a race or event depends on whether or not you pinch your charging cable, then maybe stick to more mainstream brands.
I'm willing to risk it some... At the minimum having the ability to get replacements is a must, but having a good seller to give warranty if something fails in a way that is not my fault is what I think is a decent position to be in. I have a ECE degree so I'd honestly love to mess with internals and I'd replace electrical components if I had to. Biggest things are not wanting to be stranded over something stupid if i can help it, and not throwing money down the drain on this build.