That's the problem - adding another thing that you buy adds more consumer research to do, and there are more pressing things to worry about in life.
But it isn't pressing, just hit the demo. If the mod doesn't have one, look up videos of it, there'll definitely be a few videos on it within the first week of release. And then, after all off that, just think - am I interested in this? Do I want this? If yes, buy. If not, don't. It's not a problem really, if you can spare time to play beam, you can spare about 10 minutes or so to do that. Also, if you don't like it that much after you buy it, there's no worry. It's only 2-5 bucks max for these forum mods, so you're only losing a coffee.