"Is it worth it" greatly depends on what you are doing, how you approach your photography, and what other gear you are planning to use.
If you have a modern digital camera, then their value is greatly diminished. If you're working with a large format film camera, then they're invaluable if you like to carefully inspect the light of the scene before deciding on how to take your photo.
Boiled down, a spot meter is just another method to measure light and help you decide what the exposure is. In many ways isn't much more valuable than the "Sunny 16 Rule" is, while in others it completely blows such a primitive 'tool' out of the water.
The key impact of a spot meter is being able to accurately and precisely take a reading of a very specific part of the image to judge how bright or dim it really is, and then being able to compare that to other parts of the image.
However, the same effect can be achieved with careful use of a cellphone camera, especially one that gives you control over exposure.
Spot meters are highly useful, but they are not magical devices that will instantly improve your photography. Like other metering options, their value comes from careful understanding of their function and how to use them.
If you don't see yourself being able to debate about the merits of where the highlights, midtones, shadows, and blacks should be even before taking a photo, then you are unlikely to find a great deal of value out of most spot meters. However, if reading about subjects like The Zone Metering System [based on Ansel Adams and Fred Archer's work, not the modern digital meter modes found on some cameras] really clicks with you, then a spot meter may easily become your best friend.
Lastly, consider your options when it comes to what meter you buy.
Ideally you will want a 1 degree meter. Wider meters can be useful, but they can be harder to use well for accurate clean work, and are at risk of giving 'muddy' results.
You may also find that an 'all in one' solution may not be the most effective for you. Personally I use a tiny gossen thing that fits in my hand for incident and flash metering, and have an old Capital Digital SP II spot meter that I picked up for cheap from an online used camera dealer. [I find they have less 'fiddling points' to faff about with, especially the Capital Digital, which has two buttons: One to meter the light, and one to lock down the readout if it is fluttering...]
Possibly a personal bias, but if a light meter doesn't contain a dial scale that lets you look at all your options for f/stops and shutter speeds for a given exposure, then it isn't a 'real' meter...