I bought 1 of these last year and it ripped when i erected it ,went back to store and they gave me a replacement cover, i duck taped the original and grew loads of toms and cues ,
put new one over old one and it protected tender plants through last winter, i have bought an aliminium greenhouse this year but with health problems ,not erected yet, so i am using the plastic again ,and my toms and cues are lovely, first cue eaten yesterday ;D,
as long as it is secured down for high winds no problems