Having plugged this in, it made me think a little on design aspect of these routers, and of course that zyxel have way way too many sku's. half a dozen different model's and all with A/D variants as well.
The 3925 has the cable ports a flipped 180 vs different unit, its already annoying that it changes from brand to brand with no universal standard, but I was surprised to see a flip within the same brand, cable's overtime kind of "wear in" to a shape, a bend so to speak, so flipping cables round isnt ideal.
There is also the lack of consistent design across models.
I have a 8924, 3925 and now a 1312, all 3 are different designs. The 3925 is definitely the best of the lot, a similar design to the 8800nl. The 1312, is better than the bulky curvy 8924, but has horrible oversized led's.
There is the subject of the dsl filter, is it a device that actually offers a tangible benefit? There is too many respected members of the community who say it does, so I accept that, but it seems on my line routers with a built in filter dont offer any advantage, so it would seem that its a situational thing. Newt's line also wasnt helped by one. I think same with skyeci.
Sadly my favourite zyxel device is not popular with developers, no profile for it in dslstats and no firmware from johnson or john. However the jumbo frames firmware that was made for it is stable on the 3925. So it does have a jumbo frames firmware. Which means I will probably go back to it next week.
I will provide feedback on ES rates on the 1312 after a reasonable period of dsl uptime to assess behaviour over time.
Early thoughts are from a value point of view the 3925 is better, better design, similar cost, better spec'd. However it is petty as end of day most people are buying these for bridge devices, and for that purpose they all are "good enough". But the better spec would allow the switch over to a router more easily if a situation demanded it.
hourly 3925 ES average at circa 73000 sync was 8.07, will report back later in week with average for 1312 (73200 sync).