Blacksys has a new 2ch cam out, but like the 'Mini' series cams I won't recommend it because of the history of issues with their previous models. It may or may not prove OK. The older 2ch cams still have their known issues. Of the single-channel cams Viofo has been the most prolific and their newest versions of the A119 series seem to be very good cams for the prices asked. The WR-1 us small and interesting but too new to know well yet. The G1W-S offers great low-light performance cheaply. Others like the Vico-Opia2, Thinkware F800, Chupad D501, Gokuk T3, and Garmin 55 are looking pretty good so far and some like the SJ Dash, Innov C3, Waylens, and Cobra models might prove good. Hardware limitations still afflict all the 2ch cams (mostly low bitrate) and of those I can recommend only the SG9663DC and the old F770. And I too feel better performance comes from 2 single cams.
Of the singles, the A119 series newest models offer higher-end performance at mid-level prices. They might have some QC issues but when bought from a good seller the warranty handles that, and few are the failures in service. IMHO it is the most significant dashcam of 2017. Following on it's heels is the WR-1, discreet and interesting, and their G1W-S which excels at night at the cost of being only OK daytime. The Chupad D501 looks to be a mid-price winner, The Goluk T3 has a decent parking mode, the Garmin 55 sits higher up the scale. Other than the WR-1 with it's newness, all these have shown to be reliable enough that I can recommend them. On the cheap end of things I've found the G1W-HC a bargain with vids as good as cams costing double and good reliability, however very few trustworthy reviews are out there as it seems few have been sold. The G1W-S fills a similar spot at a higher price as does the Viofo A118C. But all is not well in the dashcam world and we've seen problems.
The Mobius M2 has disappointed and is a dud design. The DR650 has given some users problems, the Opia2 is similar, the WR-1 wifi apps are still flaky but will probably get worked out, the Waylens is having some issues when ran for extended times but has features galore, the SJ Dash isn't settled yet but doesn't look like it will be more than average at best, the Innov C3 is developing too slowly, and most of the action dams have had little development toward dashcam usage.
One thing worth a separate mention is that the excellent Sony Exmor series sensor is now being seen in many more cams- even cheaper ones- and that is probably the single most significant dashcam-related event of this year so far. So now I think you'll too agree that it has been an interesting year for dashcam enthusiasts with good progress made but more progress possible. There are certainly many more cams worth your money in most price ranges than in the past so IMHO it's a good time to buy, as I don't see any signs of any thing more than the further development of existing models happening in the next year.
All this is just my thoughts and opinions based mostly on what I've seen here on DCT from members who have cam experience and seem to be reasonable and trustworthy. I won't debate any of this here as others have their own opinions. Other than the M2 it's not meant to be bashing any cam or manufacturer, and you should research any cams you're interested in and make your own decisions- that will never change.
Phil