I purchased my first blueseventy jammer last March and it's still in good shape.  I swim 3 to 5 times each week in a heavily chlorinated pool; in the past I would go through a Jammer every month in a half to two months, now I can go 6 months plus!  It's color has faded, but it still fits really well and isn't see through like some Jammers are after a few months of usage.

I swim about 5 hours a week.  I've used Xterra, Orca, and now Blue Seventy.  

In terms of comfort, they're ok.  Nothing to really get excited about but they do the job just fine. I think the Xterra Tri shorts probably rate the best in comfort in the pool.  But if you're only swimming, you can't really go wrong with the B70.  Price wise they're a lot cheaper then Xterra or Orca but then again these particular B70 shorts are for the pool only.
 
 Durability - I've only been using these shorts for a little over a month, and the colors are already starting to fade.  

I deducted one star for comfort, and one star for the fading dyes in the shorts.

I've swam a few times in this jammer so far and have no complaints.  I did benefit from some previous reviews on the sizing so here's my take on it.  If you measure your waist and order that size, then they will probably fit well.  I measured a 36 and the suit fits great.  I wear a 32 in speedo, nike, etc.  I have found that very little clothing is made to actual measurements, makes no sense to me.  The lycra seems heavier in this suit also which contributes to less stretch so tight suits would not feel good.  I'm hoping the heavier lycra means it's more durable.  I like it overall and suit #2 will be on order shortly.

Even though I bought one in my size, the fit was too small.  Buy one size up and you should be fine.

I like everything about it - cut, design, color, quality - except that the bottom seam is finished in a way that it is not very flexible so that it forms a tight band that squeezes my quad, even though in every other way the jammer fits great.  That's not a huge deal and you don't notice it in the water.  It is more of a cosmetic issue.

I've only worn this Jammer once.  Feels true to size; snug and is comfortable.  Not too long which is good for me.  Would have rated higher but just haven't worn them much.