10GBASE-T SFP+ to RJ45 Transceiver, 10G Ethernet Copper Module, Optical SFP RJ 45 10Gb T Mini-GBIC Compatible with Cisco SFP-10G-T-S, Ubiquiti UF-RJ45-10G, Mikrotik, Supermicro, Fortinet, up to 30m

I have had zero issues with these modules. I have not had a switch or NIC that has complained about them so the compatibly is great. These allow me to use the full speed of my ISP plan. A lot of other reviews mention that the module gets hot under load and I can confirm but it can be mitigated by putting a little heatsink on the exposed part of the module or having a little USB fan blowing on it.

Cheap, work well with Unifi gear (switches mostly). I mostly use these with somewhat short cables, anything over 30feet I went with fiber.

Excellent product, it works well between two 10G SFP+ ports on a Brocade ICX-7450 running Ruckus Unleashed/Fast Iron and using a 50 ft Cat 8 Ethernet cable. Also works great with one end plugged into a 2.5 GbE port. They get very warm, but not scalding hot, and not so much they feel like they'll melt or that performance seems to be impacted.

works well. just as described. easy to install

TL;DR: If your switch port supports egress limits of 2.5Gbps or 5Gbps. You should have good luck with your 2.5/5g ethernet ports. Otherwise, measure with iperf and pay attention to iperf traffic direction before you celebrate.I have a Gigabyte Aorus AM4 ITX board with a RealTek 2.5G port. When connected to my Ubiquiti XG-16switch however, the ethernet ports negotiate at 1Gbps only. This transceiver popped up in my search as something that will enable the full 2.5Gbe.Plugged it in and everything seemed to work great. Switch sees it as a 10Gbe SFP link while windows sees it as a 2.5Gbe link. Large file transfers looked good too. Between 80-130MB/s. Not great but ok.Running iperf3 however, revealed a big issue with my setup. My NAS (ReadyNas 626X with 10Gbe ethernet) on the same switch ran iperf3 in server mode (iperf3 -s) while the PC ran it in client mode (iperf3 -c): this reported a solid 2.37Gbit/s. Great right! However, large file transfer in use felt worse that with my 1Gbe link. The NAS has a xeon processor and can easily handle the needed 10Gbit speeds for iperf3 (I have a 5950x on the PC which is a beast): tested with a different 10Gbe machine on my network.Investigating further it turns out that I misunderstood. iperf server does not actually serve!! The iperf client pushes data to the server. I need to run the client (PC) with '-R' flag to have the client consume data (switch pushing data into the transeiver).So traffic from PC -> Transciever -> XG16 -> NAS went though at full speed 2.37Gbit/sTraffic from NAS -> XG16 -> Transciever -> PC was a miserable 200-600Mbit/s with tons of retries.If I remove the transceiver and switch to the automatic 1Gbit downgrade (with egress limiting), iperf3 gives me 970MBit/s with 0 retries. Way better than with this transceiver.The general diagnosis at this point seems to be that the switch is pushing packets too fast for the port to handle and dropping a lot of packets slowing everything down. Solution seems to be to turn on egress rate limiting on the port. Basically, tell the switch that even though the SFP+ port negotiates at 10Gbits, limit outgoing traffic to 2.5Gbit/s. However, Ubiquiti in their wisdom do not allow egress rate limiting to more than 1Gbit/s: on a 10Gbit switch! Why!! Gah!So yeah: make sure that your switch can handle egress limits at whatever reduced speed you want to run your 10G connection at. Better still, pick up a Mellanox ConnectX-3 if you have the PCI slot for it.

Working perfectly on UDMPro

It works as advertised.

Working great in an Intel X710-DA2 nic