I upgraded to the DIR-890L
and I've been very happy thus far! Solid router other than a few "bugs" that need to be squashed
I just "retired" my DGL-5500 less than two weeks ago. I was using my 5500 as my main router. I had the DIR-868L connected [via ethernet cable] and used as an Access Point. I also had a network switch (HP J9449A) connected to the 5500. Both worked very well. I had another network switch (HP J9449A) connected to the DIR-868L. This set up served my home / family very well.
As for the DGL-5500, it was a solid router, but I feel it fell short of initial expectations as a gaming router. Some of the firmware versions released were worse than previous versions! OMG, it was a nightmare for awhile (IMO).
I'm sure Furry remembers my "rants"
It seems the latest firmware is probably the last firmware version, maybe not, but I"m guessing it might be. In regards to the latest firmware, I didn't have any issues. It was pretty solid for the most part and served my home networking needs. I have a lot of devices, both wired and wireless, that are part of my home network. A LOT! I wasn't having any problems the last few months, but I did have ABE disabled in the router settings. I'm thinking that saved me some headaches and heartaches.
Back to the 890L. Wth my ISP speeds being 100 down / 5 up, there's really no need for "streamboost" technology IMO. I'm hoping an upcoming firmware release for the 890L addresses the QoS issues (not being able to save devices), and the renaming devices issue gets addressed / fixed. I've put the 890L to the test - gaming (multiplayer) simultaneously using two Xbox One gaming consoles, streaming Netflix via Apple TV, streaming Netflix via Smart TV, browsing the internet, and steaming YouTube. The 890L DID NOT "cave in". It continued performing as expected! I'm 100% completely satisfied with my upgrade to the 890L from the 5500.
If I could offer a suggestion? Take a look at the DIR-890L forum. You'll gather a lot of information (good / bad / indifferent) regarding the router. Another solid router is the 868L. Finally, continue to look over the 5500 forum posts. You'll get a pretty good sense of the issue / problems people were having, as well as some of the positive results the 5500 provided for users.
I hope this helped a little bit. Furry will chime in, I'm sure!
He's a great resource and helped me all the way back in the DGL-4500 days