Mine is originally using Baconreader while in the dorm community bathroom doing a deuce and seeing a mention of Sync. Installed and instantly became a user. Later on I had a problem with the app because I was running beta Android. Reached out to the dev and after a few fix attempts an update was posted that fixed the issue. To get that kind of support is rare and is why I have continued to stand by Sync all these years.
My Reddit profile is 15 years old, so I've been around for quite a while. At that time, I don't believe there really was any real alternatives to browsing on a PC.
After some time just using vanilla, I discovered I could make my browsing experience better by using RES, and that's what I'd use until BaconReader became a thing. I bought the pro version of BR in 2011.
When more third party apps started to hit the scene, I think I was a bit stubborn at first, and didn't want to trade out BaconReader. But after a while, I caved and decided to give the alternatives a try. I bought both Reddita, Relay for Reddit and RIF is Fun, in 2012. I believe I mostly used RIF for a couple of years.
Sync Pro was bought on June 7th 2014, and I haven't used anything else since. It's definately my most used app of all time, and it's strange to think that it was 9 years almost to the day from my initial purchase till I uninstalled it from my phone and decided to quit Reddit.
Can't wait to get my hands on Sync for Lemmy, and will definately purchase it at once, as soon as I'm able.