This kind of service really depends. How many records do you want to use this service for before you've wasted money by not doing it yourself. After that, is the cost worth the time savings of a few minutes to you.

Like guitar players who can't change their own strings; I think if you're really invested in record collecting you should buy the equipment and learn to do this kind of thing. Especially if you're big into buying used records. It's really hilarious to me that people spend thousands on hifi equipment and even more on records over time but won't invest a fraction of that in a good cleaning machine and maybe even a flattener. Be it a Spin Clean and Vinyl Flat or a VPI and Orb.

Also, Ultrasonic cleaning seems very niche. It's the kind of thing you would only really need if you have something so dirty and messed up that you might consider doing the wood glue trick for IMO. I mean if you're properly storing your records a regular cleaner should likely be effective 99.9% of the time. And doing an ultrasonic round you would want to have a way of removing remaining liquid anyways (not air drying) e.g. vacuum.