We did not do EC with Avalon and we did potty boot camp with her at 19-20 months. We just went diaperless, no panties, and used diapers when we had to be out and about for some reason. We stayed home the first week, though, and just concentrated on the potty. She is very spirited and would not sit on the potty every 30 minutes and certainly wouldn't stay seated for long enough to make something happen. I knew kids that were fine being put on the potty regularly and others that would just sit there and hang out for like 10 minutes reading books until they went. Not Avalon. So instead I had to follow her around with the potty. We went about our regular day around the house, but one of us was on potty duty and we'd switch off every couple of hours so we didn't burn out completely. As soon as she started to go, we'd shove the potty under her and after about four days, she started to improve and after a week so was doing quite well. We had tons of accidents still, but if we were very vigilant about taking her to bathrooms regularly she'd be fine. And, IMO even 1-2 daily accidents are better than using diapers. She went down to several weekly accidents and then monthly and then none within a few months and was night trained by 2.5 years. Keep in mind that when you train this early, generally the child still needs to be taken to the bathroom on a regular basis for a while. Eventually they will self initiate and eventually they can take themselves to the bathroom on their own. This is a process.
We part time ECed Austin and we used the same method with him at 20ish months and it took him about 2 days to get to the point where Avalon was after a week of boot camp. He continued to have frequent accidents for quite some time, though. I'd say he was mostly accident free and taking himself to the bathroom by 2.5 years old or so. He still is not 100% night trained and he's nearly 3.5. Every child is different!
Avery has been part time ECed as well, but from an earlier age and he's showing more mastery of the process than Austin was at this age. Dh is taking the olders out of town in a week or so and I plan on using that time to do potty boot camp with him. He'll be just shy of 18 months at that point, so my youngest attempt so far. But he's indicating the need to go or the fact that he's already gone almost all the time. It's really only when he's distracted by playing (especially outside) that he doesn't initiate. We were out all morning (8am to noon) today and he was dry when we got home. Avery is dry at night with one pottying in the early morning (like 4-6am). I think that we'll be in underwear full time pretty quickly, but I also think that he'll need to be taken to the potty (or a tree) frequently when he's outside.
I think I mentioned in another thread that I like the Ikea $4 potty. Cheap, light weight, all one piece for easy cleaning, and a good shape for toddlers (boys or girls).
Note: he sat down by himself and is seated sideways.