Sorry.. longish post.
I've a pair of Nuprol mesh goggles I bought out of sheer frustration from fogging and sweat streaming down the lenses of goggles. I used them for half a day with no real issue but in the back of my mind I just wasn't happy about the thought of particles going through should a bb shatter. I play frontline where it's messy.
After the last game I bought some Revision SawFlys and they are brilliant. No fogging at all and just a little sweat line towards the end of a mornings game. Wiped off and ready for the afternoon game. Cool. I admit I'm a little concerned about the openess of the glasses sides. Not from oncoming fire but normally there's always some noob on your team that dumps his load on your back (ooo-er). It's those "from behind" shots I worry about getting in the glasses. Chances are slim but probably greater than a bb shattering with mesh. I do wear the drop down kneck protector on a bush hat so it does help with rear shots a little plus the tigris mask lines up pretty damn well too.
Anywho (stay on target!); in the same last game there was a Borat look-a-like on the other team using a DMR well within the 30m minimum engagement rule. He shot my glasses from about 6m (through a palette which is banned where I play, it's just viewed as solid cover hence I hadn't shot him first and I had a good spot - even knew he was there!

). BANG in the right eye lense. Thank god for ballistic plastics! Had it been mesh I reckon it would have been either a "go through" or a shattered BB. Or it could have been fine. I was furious to say the least... it sounded like breaking glass.
Anyway my point is you never know what some tool is going to do especially if they flounce the rules of the field in play.
Incidently another forum member who was playing got a BB right in the mouth of his tigris mesh and it nearly went all the way through. At least a 6mm BB sized depression, paint gone and mesh spread. Mesh is not as strong as I thought! Again my money's on Borat for that too...
I've had Revision V Ants, ASG strike hybrid goggle glasses (Valken Zulu double lense style), Nuprol Mesh and now Revision Sawflys. Only the Revisions have true ballistic lenses in my list. The SawFlys are the only ones that have got me through a game without pause.
Wear the best goggles you can afford. Put them above any other purchase, it's all useless if you can't see.