The OPA2189 is a relatively new amplifier - it had 'preview' status in its datasheet up until 12-2018 with the rev-D datasheet, when it finally went into production status. So, you're not sleeping - it's new!
I've been using the Analog ADA4522-2 for dual DC servo uses, and it's roughly equivalent to the OPA2189. I do want to try the OPA2189, and for some circuits, the 2189 might be quieter or have less offset, but for my uses, the 4522-2 works well enough. It gives me an 'end-of-the-day' simulated offset of around 8-10µV, and a measured offset of about the same value, which is frankly at the limits of my Keysight 34461A meter, so that number should probably not be trusted. Still, back to reality, having a direct coupled amplifier with a net DC output offset of 10µV is fine with me.
One hurdle with a dual servo using a chopper amp is the possibility of beat frequency problems that could happen when using two unsynchronized single chopper amps (such as the OPA189 or the ADA4522-1). The ADA4522-2 seems to use one oscillator for both amplifiers, and this prevents beat frequency problems. It also uses a relatively high switching frequency (800kHz?), and a typical integrator circuit will indeed lowpass filter this noise into oblivion. I extensively tested this theory with an APx-555 (which can do 1M sample, 24 bit, 1.2MHz BW FFTs) with the DUT inside of a steel and aluminum Faraday cage, and aside from AM band leakage into the star-quad test leads and the APx, there is no HF gunk from a dual servo built with an ADA4522-2. I also tested the servo integrator with an RC post filter, and that produced the same results as without the post filter - all the hash I measure is due to metropolitan Boston and the imperfections of my test leads and the APx-555.
So, while the OPA2189 is a very attractive amplifier, I spent enough time qualifying the ADA4522-2 (and have a lot of other work to do) so I haven't tested the OPA2189 yet. However, that doesn't mean that you should not consider it - it is truly a fine amplifier, and while I'm just guessing, I would assume that there's only one oscillator in the dual 2189, making it suitable for a dual servo circuit.