Interesting, because when they were relatively new, they were also the cheap option. Sous vide used to be a $1000+ thing. I did a DIY version for around $200, but later Anova came out and it was less sketchy than my box of wires running mains voltage.

Instant Pot seems to make a pretty good one that fits around the sides of their pressure cookers.

Anova's app is basically useless. Could be nice for looking up temperatures and times for specific things, but I usually google it, anyway. Steaks are by far the most common thing I do sous vide, so it's usually preset for that. Never used the app outside of playing with it when I first got it.

One thing is for sure: I won't be recommending Anova to friends anymore.