I've had the 173's 6309-based predecessor for the last 20 years and had no complaints:
While the watch is tough as nails and looks good on the rubber strap, I went through enough straps because they kept breaking, and I eventually fitted a Jubilee-style Seiko bracelet to it.
The lack of hacking and manual winding can get annoying to someone who's used to a modern Rolex movement, and of course, if you like COSC accuracy you're likely to be disappointed.
However, keep in mind that the 7S26 was never designed to be like the 3135 in function, and in that light, it's an excellent watch.