Don’t let some of the above put you off.
I have owned a Road Machine for just over 3 years and have some circa 700 rides recorded on it via TR and it has been faultless mechanically.
One positive which often gets overlooked which most trainers can’t do if you use ERG only, is help with pedaling smoothness. Having spent hundreds of hours transfixed at that top left corner trying to match / smooth out Power against Target, I can see if I look back at some of my early rides when I started out, that my power was let’s just say, a little jagged, compared to how it is today. This is not something you actively work on if using a trainer with ERG. On my other trainer I use to just switch off a little to cadence technique, as the power line stayed smooth no matter how choppy / stomping your pedaling got.
I also like the fact that if you are putting out 280W at 90RPM but need to push 290W, you have to pedal just that little bit faster like you would do on the road, so get to train at lots of varying cadences, whereas if I was using my old Snap in ERG I’d just sit at a comfortable cadence and let the trainer work its magic and not experience pedaling just that little bit faster to produce more power, unless @chad reminded me to in one of the prompts.
Another thing which I would recommend, is that a couple of months ago I invested in the Pro Flywheel and I wished I had done it sooner, as it is even smoother than it was before with a lovely feel to the kick over / inertia.
At the same time I also upgraded it with the InRide 3 as I had previously used virtual power but I have always liked the idea of calibrating it so as to rule out variance in knob tightness whilst using virtual power. So far the InRide has been fine, caveat - despite being unable to calibrate it with ANT+, and the cadence being shocking, but as it has been mentioned previously, if you have a dedicated cadence sensor, use it.
If you buy a Road Machine / Rock and Roll you will not be disappointed, and if you purchase one for a sensible price, you should find it will be a half decent investment if you ever come to sell.
Let us know how you get on, and what you go for in the end.