Loved mine but...
I've had the elite and platinum, two of the best canisters I've ever used esp when you have the two row brush roller that is standard in the platinum. But... The handle design that is used on other comanies like Bosch and pro aqua to name a few gets in the way when trying to use a dusting brush or upholstery tool at the end of the hose, you have to hold the handle on its side to get the job done or just attach it to the end of the wand. Both of mine suffered the same issue that the main unit would randomly cycle through speeds during use and would make this kind of grumbling noise and the unit would shake. These were very short lived when they happened but still an annoyance. Also when using the power nozzle and putting it in the upright position while brush is still on the nozzle shuts off like it's supposed to, once you release it the PN comes back on but the canister shuts down then immediately comes back on, this happened every other time and no dealer could explain it. The above issues happened equally to my elite and platinum, I was expecting more issues with the platinum and its display compared to the elite but they both acted up the same.
I was just thinking about buying a platinum again after I sold both of mine 3 years ago, they are just all around great. If you have a good dealer that can work resolving any issues than go for it. I will say those problems didnt mean I could not use the machine, it was just annoying little electrical gremlins. None of the above issues got any worse as time went on, my one dealer replaced both boards and said the machine is fine and if it does it again bring it in or just live with them since they are not doing any harm, so I just lived with them.
The power nozzle is fantastic, very smooth and like I stated earlier with the two row brush standard in the platinum it really digs/ agitates the carpet. I have a 12" quick disconnect I bought from lindhaus for my central vac, it has the same telescopic wand as the aria does just with a top to fit a standard CV hose. I also liked having the two carry handles, the one on the top is perfectly placed.
Feel free to ask more questions, like I said I'm thinking about buying a platinum again. I'm sure in the couple of years they may have improved the electronics, I know the PN on the platinum now has LED lights. Al from lindhaus even told my dealer my electronic issues were a common problem they were trying to sort out.