This seems minor, but it is critical. The basic version forces interstitial ads between sets, breaking your "flow state." Neuroscience proves that interruptions during the refractory period of a reflex arc ruin long-term potentiation. The better activation code removes these interruptions entirely, allowing for 45-minute uninterrupted neuro-priming sessions.
The hesitation usually comes down to price. The standard activation is often free or bundled with hardware at $9.99. The premium option typically retails between $49 and $99 annually. reflex+xtr+activation+code+better