They just arrived! So now I get to try them out for the first time. I expect that I'll like them. I'll post what I think after I get them set up.
Thoughts upon first usage (two Finnex 24/7 30" fixtures):
Size: The light fixture is indeed small and super thin! It sets on the 29g tank perfectly. I'm not using the legs so the leg "stubs" rest on top of the black tank rim. To lay the fixture flat, it must be pushed over to one side so that the leg "stubs" will lay on the glass top on one side and off the edge on the other side.
Cord Placement: There are cords coming out on both ends of the fixture: (1) power cord and (2) cord for remote control receiver. I'm not nuts about not having a clean side on the fixture, but that's pretty minor. I was concerned that the cords would be a problem with the 29g tank with a canopy, but it just does fit.
Cord Length: I do not like the length of the cord from the fixture to the brick power supply. It's too short to reach the floor so it hangs in mid-air, pulling on the cord. I'll secure the brick to the stand with velcro so it won't continue to be hanging. I'm happy to not have a brick for a plug, but I don't like having a brick hanging.
Quick Setup: Once the fixture is plugged in, it appears to go into the 24/7 mode automatically. The light looked dim and red which I suppose is its morning color. I didn't like it very much to be honest. Using the remote control to change the settings was simple enough. Just press buttons. Make sure to press the 24/7 button as needed.
Light: After not liking the initial color, I tried out the "Max" light setting. Now I like that color! It's only slightly whiter than I'm used to. So I can see that I will be able to get a light setting I like. I'll just have to play with it a bit.
Remote Timer: This is a little weird. Instead of having buttons to set the current time, there are buttons preset for specific times: 12am, 3am, 6am, 9am, 12pm, 3pm, 6pm, and 9pm. That means you need to wait until your time is one of those 8 preset times to set the time on the light fixture. If it's 6:15pm, you need to wait 2 hours and 45 minutes for the first chance to set the time (9pm). If you miss that, you need to wait again. Maybe setting an alarm on your phone would help.
For now, I have the time set and have the fixtures running through their 24/7 automated color changes. It's rather red and dim at the moment (6:30pm). I'll let it run through its color cycle just to see what the 24/7 is like, but then I'm pretty sure I'll change it to another setting very soon. The colors just feel too artificial to me right now -- kind of like christmas lights. I might like it better if I was just starting out in the hobby, but having seen my tanks look a certain way for a decade, changing the light color that drastically just doesn't look right. Nevertheless, I believe I will like these lights once I adjust them to my preferred color.
I am disappointed, however, to find that I cannot adjust the dimming over time. I either use the 24/7 mode or I select ONE color with ONE brightness and leave it at that (using a regular timer). I had hoped I could set it to be dim in the morning, bright in the afternoon, and then dim in the evening using the memory settings. It cannot do that. I either have a fixed color/dim level the entire time the fixture is turned on or I use the 24/7 mode.
The fixtures also don't appear to be able to cook my breakfast in the morning. What a let down! LOL!
While I may not like some of the features of the fixtures, I was mainly looking for LED light fixtures to replace my old T5 fixtures, and in that way, I think these are going to work out well. Basically, I have switched from T5 to LED lights and have gained the ability to set the lights to the color and brightness I want. I'm happy enough with that.