Audio Desk Systeme RCM - what's been your experience?

I agree with Dgarretson et al: DIY is both better and cheaper. Like DG, I use the Elmasonic. I have cleaned most of my 3000 records, some of them three times, with no hint of trouble.

Let me save you from my mistakes.

First, make sure than your cleaning chemistry is hot, about 45 C.
Second, make sure that there is enough space between the records as well as between the records and the tank walls for the ultrasonic wave to develop. For 80 KHz, that means 0.75 inches, IF IF IF the records are perfectly parallel. Which they are not. Since records have been known to have warps, that means, in practice, a gap of 1 to 1.5 inches.
Third, I rinse heroically. I flush with running filtered water, immerse in filtered water, flush with twice-filtered water, and immerse in distilled water. Water from the final rinse flows off the record like water from a freshly waxed fender.
Fourth, I air dry without a fan, since my basement is not a clean room.
Fifth, new sleeves. This identifies cleaned records, as well as stops the spread of contaminants.

That’s what works for me. YMMD

Whart, about filtration.

The Elmasonic is well made from top to bottom, and that includes the drain valve. If I let the solution sit for a few hours, sediment settles to the bottom, I open the drain valve to a very thin stream, and leave it to drain overnight. Result: 90% of the crud at the bottom of the tank, ready to be washed away, and a virtually clean cleaning solution.

I would not be too worried about microscopic particles, because  ultrasonic cavitation should prevent their attachment to the record. That is, if you use a recommended detergent, so that grease goes into solution. Which is the best reason to use a detergent.

I like VersaClean from Fisher Scientific, which is said to be specially formulated for plastics; and since that is from a scientific supply company, where things have to work as advertised, I would tend to trust it. Further, my experience tends to confirm it.

Hot chemistry - should have mentioned that it can warp your records right smartly if something jams and the record stops turning. Conversely, a slightly warped record can straighten out after 10 minutes or so.

My suggestion:
Audio Desk Systeme clean.
Rinse with reagent grade water on VPI. 
Despite my problems with the earlier ADS machine, I think they have solved it and rinsing cannot hurt.

@terry9 : extremely helpful on several fronts.
I don't want to hijack @soulbrass 's topic about reliability of the ADS, so perhaps we can start another thread on the DIY approach. 

Soulbrass, at least from my experience with both the ADS and KL, the commercially branded "audiophile" solutions like the ADS and KL are both pretty well thought-out machines that are effective record cleaners; that Robert Stein who brings ADS into the States has been very good about supporting the ADS here;  that some of the customer problems of the ADS may have been due to the fact that the machine was a pretty innovative, early effort to address a " complete one step solution" for record cleaning, but with the rollers and computer functions to activate it, is more complex than a plain vanilla ultrasonic bath. (I gather that the "Pro" version embodies improvements, but haven't used it). But, to me,  part of the answer to your question about "what next"  is a digression into DIY, which isn't just about a cheaper alternative (though it can be) but a more effective one, for some of the reasons stated. You might consider exploring that path as well.