Experimental software which does not sometimes work properly (no positive effect to EEG).
Software can change measurable brainwaves a bit but how it affects to brain performance is unknown.
Requires fast CPU and running times even for small effects are long (hours). Typically, you need about 10+ models before some useful results. It means hours of stimulation/computation.
You need to actively concentrate on the audiovisual stimuli for hours which is tiresome. You can also only use software audio-only and listen sounds with headphones and with eyes closed.
Not for people with epilepsy. Flíckering lights and sounds.
Changes to EEG or EEG-metrics is sometimes about 1-3%. 5-10% change is (maybe)needed for measurable cognitive effects (thought faint signals are also important brain processes).
Command-line software is hard to use but there is also graphical user interface version.