Take these examples:

The Tango from FuckTech's website has most of the features I want. Variable length, stroke, patterns, all available on the fly without needing to change anything. From a programming perspective, its hands down the best on the market. Originally, they used drum stands to help orient it perfectly. However, for rougher usage, that was just moving around too much for most users. They added a "H" bar setup that looks much more stable, (would link pictures, but from FetLife, so can't). I've spoken with the manufacturers (wife does sales, husband does the building) and they are both well informed and pleasant.

As comparison, the Kong from Orgasm Alley is the most sturdy machine on the market. It uses a 3/8 HP motor with 124 in-lbs of torque. Its the most powerful motor (for a commercial sex machine) on the market. Furthermore, the design of the casing (or whatever you want to call it) is heavy. Once you place that, its not going anywhere. This website sells a variety of sex machines, and will even make custom ones on request. The owner here is quick with his responses. When I asked a few questions about the Kong, he replied in about 4 hours. I was amazed.

There's also the ShockSpot, but from several reviews, what it offers, I think this company spent more money on marketing and trying to get professionals to use and talk about it than on the engineering. I don't consider this a worthwhile machine.
Now this last machine is really in a league of its own. While the above machines are just a sex machine, and cost about $2,000 USD, this third one is very different. It is a full on sex machine with some very nice furniture to go with it.

This is the Ibis Eros. It is absolutely beautiful. The wood, leather, and color is wonderful. It looks very ergonomic, and perfect for a relaxing day/night to have incredible orgasms.
However, I've been unable to contact the manufacturer to have a few questions answered. They mention any toy is compatible with it, but until I hear back, it looks like this is not compatible with larger toys, only the ones they advertise.
A much bigger factor though for most people is the cost. They market this as a luxury sex machine, and I can see why. The cost for this is $9,000-$11,600 depending on model.
Years ago I spent $5k on my bed, because I was having all sorts of sleeping problems. It was life changing. If I had a house fire and needed a new bed, I would spend $10k in a heartbeat to replace it. I feel the same way about a sex machine. If I could piece together the patterns of the Tango, the power of the Kong, with the ergonomics of the ibis (or maybe something from Liberator's website), it would be perfect.