One thing to be wary of Plasticovers is they aren't always flat on the underside, so they can leak at the side rails (just above the base of the window) which will make your bari feel unresponsive as if it has a leak at the top end somewhere, or they'll squeak uncontrollably. And as they're plastic coated, they won't absorb moisture like a plain cane reed so they won't conform to the table and rails of your mouthpiece as fast as a normal cane reed will.
You're still best wetting the underside of the reed before playing to ensure it seals well against the table. When you get a good one, you should look after it well, but you can leave it on the mouthpiece after playing so it conforms to the table and side rails so it seals better and is ready for use. Check the flatness of both your mouthpiece table and the underside of the reed as that will ensure the best playability.
I had a Plasticover bari reed in full time use for around 4 years, but it did gradually lose its strength over that time.