Pros
1. Thick glass, very durable and very difficult to break
2. Can withstand high pressures [nice for some belgians, not sure but they maybe nearly as strong as champagne style bottles]
3. No capping - they have fliptops
4. 15.2 oz each - so you need about 40 or so for a 5 gal batch
5. Long term storage for bigger brews like quads and such
6. Inventory variety - I have 11 diff. beers in bottles right now, one of them was brewed in 2013.
I have 178 Grolsch fliptop bottles - currently have a Coffee Porter, 2 different IPAs, Dubbel, Tripel, Munich Helles, Wee Heavy Strong Scotch Ale, and a Golden Strong Ale in Grolsch bottles and a black IPA, a Stout and a quad in brown bottles.
7. Gaskets last forever, never had to replace one, once I flipped one over
8. Closet storage vs a dedicated keg frig
9. We like Grolsch
The larger volume and fliptops cuts the time significantly
Cons
1. You might not like Grolsch, but I wouldn't buy the LHBS brown fliptops, they are not as substantial as Grolsch
2. Because they are green, must store them in the dark
3. Cost, Grolsch fliptops are not cheap at over $2 a pop, but still a lot cheaper than kegging and you get to drink the beer
4. Cleaning btwn uses, let sit overnight with 1 drop bleach and fill with water, drain and keep fliptop on loose between batches
5. Takes me 90 minutes to bottle a batch by myself...5 minutes to get priming solution going, 20 mins to sanitize everything while priming solution is heating up and boiling, 15 mins to cool priming solution, 20 mins to transfer, 20 mins to fill 40 bottles, 5 mins to label, and 5 mins for cleanup. With a bottling partner, could probably do it in 1 hour.
6. More physical work
7. Effort moving and organizing bottles and loading in regrigerator ahead of time
8. 2 week wait for CO2