I also recently had to upgrade my soldering station on the cheap. My crusty 30+ year old Radio Shack mains-direct "30W" iron was waaaaaay past its prime.
I went with a "WeberDisplays 939D+" off of Amazon (Canada, but probably available just about everywhere.) It was C$59.99 (~€37.25) with 2-day Prime shipping, and it came with two elements, five tips (old Hakko style, not the new style... not sure if that's important to you), and a decent (separate) stand and some accessories. I've put it through its paces with some moderately heavy ground plane stuff as well as SMT passives (0603s mostly, couple of smaller ones) and a TSOP chip, with no problems, except my aging eyesight. Really need to get a magnifier.
I took a quick look inside and everything seems both very standard and very solid. Better than I was expecting, actually. I knew what I was getting, and have been pleasantly surprised. I've been using it for about a month now.
The only gripe I have with it is the "sleep mode" sometimes decides to cool the iron while I'm soldering, which is mildly annoying as it only takes 2-3 seconds to warm back up. I don't know if there is a way to change that. The Chinglish in the instructions is about as bad as you'd expect.
Would I recommend it? Sure. It seems to do its job well enough for the money. However, I can't comment on whether the Yihua or TS100 you're considering might be better or worse value, as I haven't used them. Hope this helps.