just my opinion but it seems to me by what i have read that reseals last 10 to 15 years and bladders which are 1000 dollars more have gone as long as 19 year with the only complaint with a leak (on a bladder)being a clamp or a seal which are cheap to fix seems to me the best bang for the buck is the bladder i'm myself thinking about bladders on my m20f and i have a 1027lb useful and i could easly remove some old stuff out of the planei dont need (adf,switch to alternator,lightwieght starter,exc.) to make up for the added weight of the bladders