They do tend to be noisy I believe and some people say they don't last very long either. I'd recommend getting either a 27cm wodent wheel or a karlie wonderland wood wheel (if you don't mind light sanding and painting with plastikote). We have the larger 30cm Wobust Wodent wheel as Charlie is huge. The wheel is huge too. The 27cm one is usually fine for most Syrians.
If you want it attached to the cage I'd get the Wodent wheel - I've found they work better hung from the top of the cage, than they do on their stand.
If you want it floorstanding I'd get the Karlie Wonderland one - nice sturdy base.
This is ours attached to the cage and as a comparison, a photo of the 27cm wodent wheel which is more compact and not as chunky as our Wobust wheel. You take the wheel off the stand (keeping the two washers and the closing pin safe). Slot the stand through the bars on top, and then reattach the wheel. I used 3 cable ties in strategic places to keep the stand firm. Too many cable ties and the wheel can sit at a weird angle.
Karlie Wonderland 29cm on the right, 27cm Wodent wheel in the middle, 30cm Wobust wheel on the left
The Wodent wheels are only available from pet planet (out of stock) and the sugarglider site in the uk
11" Wodent Wheel (Senior) & Free Tail Guard
The Karlie wheel is available cheapest from Zooplus. There have been some issues with them having splinters on the struts or running track so you'd need to be prepared to give it a light sanding inside the track and a couple of coats of plastikote. I had one once and liked it but prefer the Wodent ones now - hamsters seem to like them too.
Wonderland Exercise Wheel: Great Small Pet Accessories at zooplus
I find them both virtually silent.