if I buy an ultrasonic cleaner for my records will I be able to hear the difference?

Short answer:  Yes, you will hear the difference.

Longer answer:  You may not like what you hear.  US isn't magic and it can't do anything for damaged records.  I found that several of my older vinyl copies weren't just dirty after cleaning them with US, they were junk.

On the other hand, the records that were just dirty played, well, not new, but much better.  Some of the rare and rarely played stuff, was simply excellent as compared to pre-US cleaning.

So, you have to make your own decision.  For me, I firmly believe US to be the single greatest advance in vinyl playback improvement since the Discwasher brush.  I think that as long as you stay within whatever you consider to be a reasonable budget, you won't go wrong. I got into mine for < $750 and that worked for me.

Good luck and happy listening no matter which way you go!

The rig I purchased was called V8.  A simple US tank with a home built rotisserie.  No drying, just drip-dry.  The guy used to advertise here.  Not sure if they are still around. Not a KL or Audio Desk, but those things are crazy expensive. You can also DIY one.  The tanks can be had off Ebay cheap and the rotisserie is easy to make.

Good luck and happy listening!