I started DIY CO2 about 6 weeks ago when I re-started up my tank. Algae is common in new tanks due to all sorts of reasons, so I can't say for certain that the algae I'm getting is due to my DIY CO2 since there are so many factors, but the rate does fluctuate quite a bit, and I'm getting algae (BBA and several others, but not bad). Don't let that scare you though.
I'm switching to pressurized now. Whether or not the fluctuation caused it, since I have zero control over CO2, I don't feel I have much of a chance to keep it at bay. I'm really glad I did DIY, because it let me see how great the plants grow, and it got me comfortable with the idea of it and CO2 concepts. It helped me realize that it's worth it to me.
It's super cheap and easy to try. If you give it a shot and get frustrated or don't like it, then just go back to what you were doing. You'll only be out a tiny bit of cash. If you give it a shot and it works great for you, like it has for many many people, then you win. Either way it's super cheap try, so I say go for it.