^ This. Also, you gotta be careful because that Ninja V setup really adds up once you buy the media and batteries. Since the consensus here is to skip the Portkeys and its flaky camera control for high-stakes work, I would suggest these two alternatives for your wedding shoot:

• Atomos Shinobi 5.2 Inch 4K HDMI Monitor
• Since you dont need the recording part, this is way more budget-friendly. The colors are much better than the cheap brands, which really matters when you're trying to nail skin tones during a ceremony.
• Desview R6 UHB 5.5 Inch 2800nit
• This one is insanely bright for the price. If it's a sunny day in Chicago, youll actually be able to see your frame without a sunhood getting in the way. Just make sure to grab a Zilr 4K HDMI High Speed Cable with Ethernet too. Those thin cables are less likely to snag on your rig while you're running around the reception. Ngl, I'd go with the Shinobi... it just feels more professional and reliable.

I had a second to think on this and honestly, skip the camera control fluff for a high-stakes gig like a wedding. In my experience, those wireless connections between the monitor and the S5II always seem to flake out right when the couple is doing their vows. I've tried many setups over the years and learned that simpler is almost always better when youre under pressure. If the Ninja is pushing your budget too hard once you add the drive and batteries, you should look at the Feelworld LUT5 5.5 inch 3000nit Ultra Bright. I've been using one as a backup for a while now and the brightness is actually superior to most others for outdoor shoots. It doesnt record, but it lets you see exactly what youre doing without any noticeable lag. The colors are surprisingly accurate out of the box, and you can load your own LUTs via SD card easily. Also, make sure you grab a solid cable like the Kondor Blue Coiled High Speed 4K HDMI Cable. People usually blame the monitor for lag or flickering, but 90% of the time it's just a crappy thin cable getting interference. Get something sturdy and youll be fine for Friday. Focus on your framing and let the camera handle the internal recording... the S5II is a beast on its own anyway.

Man, that is a tough spot to be in right before a wedding. Honestly, I had high hopes for the Portkeys LH5P II 5.5 inch 2200nit Touchscreen Monitor because the wireless control sounds like a dream, but it was kind of a nightmare in practice. Unfortunately, the connection to the S5II kept dropping for me and the menu navigation felt super clunky. Not something I would trust for a high-stakes Chicago wedding where you cant afford to mess around with settings. If you want something that just works without the lag, you gotta look at the Atomos stuff, even if it hurts the wallet. Here is what I would do to stay under that $500 mark:

• Skip the expensive Atomos-branded SSDs. Just grab a Samsung 870 EVO 500GB 2.5 Inch SATA III Internal SSD and a cheap SATA-to-USB cable for offloading. It works perfectly fine with the Atomos Ninja V 5 inch 4K HDMI Recording Monitor.
• If you really cant swing the Ninja price, maybe check out the Feelworld LUT6 6 Inch 2600nit Ultra Bright Touch Screen. It is way cheaper, and while it lacks the recording features, it is bright as hell for outdoor shots... even if the build quality is kinda plastic-y and disappointing.
• Beware of the Portkeys color calibration too. Out of the box, mine was way too magenta, which was super disappointing for skin tones. Basically, the Ninja is the only one I have used that doesnt feel like a toy. It is solid, the OS is snappy, and it wont let you down when the bride is walking down the aisle. Good luck in Chicago, hope the weather stays nice for you!