They work

Works great in a Zyxel XGS1210-12 switch. Negotiates at both 10gbps and 2.5gbps clients. Gets fairly hot, but I keep temps down with an external fan. 10G works fine for me to connect two switches at 10gbps with about 80-90ft of Cat 6.

Work fine in my 3750, no issues and no IOS complaints.

Worked ok for about 2 weeks, packets dropping here and there then suddenly without warning 1 of these failed out of nowhere. WIll need to go with something else if failed that quickly.

Worked as expected.

Had an issue with one that was dropping packets and had to return for a replacement, but otherwise, these adapters have worked excellent. They do get hot if you use them in a switch that doesnt have good ventilation, but either way, they work very well. I am currently using them in a Brocade switch and with SolarFlare network cards, and its working very well.

Worked perfectly. Just slid in the module, plugged in a cable, configured the port and it was off and running.

This is just a first impressions review but so far these modules are working great with a Cisco 3750-X that has a C3K-NM-10G uplink module inserted. I have both 10g SFP slots populated with this SFP connected to a server with an integrated Intel X550-AT2 chipset/phy (using these ports to connect an edge device rather than uplink to another switch/router, it’s just my home lab network). No special iOS configuration is required on the switch. iOS thinks they are real Cisco SFPs and they ID themselves as such. There are no SFP diagnostics/stats available that I can tell but no big deal IMO. I am using two .5m CAT6 (not CAT6a) cables with no issues, obviously this is a short run so I wasn’t expecting any issues there.

The device works as expected

Plug and play. We use these with Cisco SG300-10P and SG350-10P switches. Have not had any problems with them.