1. The sleeves can be better stuff than others. The tobacco glides better into the sleeve.
2. The smell when smoke / burn the OCB paper is pleasant, unlike cheap sleeves.
3. The taste is better than cheap sleeves to my mind.
I have withdrawn, because the price of 6 euros is not entirely justified, despite the benefits, as some providers offer the sleeves for 4 euros (commercially) 1 star.
Conclusion: Try worthwhile.