I haven't handled one of those things myself, but they seem pretty excellent for total Game Boy replacements.
Depending on how much work you want to put in fixing up your old console, it might be worth considering one of those.
For example, you'll want to replace all the OEM capacitors on your old motherboard. Even if the system works now, a modern screen will put a greater strain on the power circuit. So if the 30-year-old capacitors don't get replaced, they could quickly start to fail.
Also, laminated screens need a full shell replacement.
So, including the capacitors, you're talking about around $65 in parts.
If you're comfortable working on small electronics, it makes sense to pay the $65. But if you're not, the $99 becomes more appealing.
I've moded mine, it was fairly easy and works amazing! Havent had any issues with image distortion. Most kits the screen is the same ration so shouldnt be an issue
I just did my gbc and gba and both have been awesome. 100% recommended. You can also get plug and play lithium usb-c rechargeable batteries to replace double a's. I grabbed the bogger displays and pre-modder shells for them and they were really nicely made.