The downside is the location of the front camera on the main cam. When I want to place the cam on the existing mirror it does not fit it perfectly. When I try to pull it to the right side to get a good fit I realise that the camera on cam chokes the edge of the OE camera. So I have mounted it but there is still a small part of the OE mirror showing on the right side. Probably if the front camera was located under instead of side wards it will not block it from adjusting to get it fit perfectly on the OE mirror. When one looks at the video one realises the part holding the rear interior mirror (the bulge) is visible in the video. Maybe those intending to buy for Volvo need to know this. I have adjusted the camera but the bulge is still there. My sequoia does not have the bulging part.
There is glare from on coming cars making it at times difficult to read reg numbers. This is also applicable to the rear cam. Hope this will last.
Will update the community after 2 months. So far I give them 5 stars rating.