I've been riding a 12-28 since I got my bike in 2012, but I got a deal on an Ultegra 12-30 a while back. It's been sitting in a cabinet at home collecting dust, so I decided it's time to go on the bike. That and a new chain. I know it's a small difference, but really, that's all I'm looking for. The group I ride with from time to time all seem to have 30, 32, or 34's. I feel like I'm grinding away on the hills while they just spin past me. Now, most of them are skinny or ride a LOT more than I do (easy to do!), but as long as I own the 30, it's on the bike. The club has a climbing event on Sunday that I may go join them for. We'll see. They're shooting for 14,000 feet total. That ain't gonna happen for me, but I'll get a few thousand in. It would be a good chance to break in the new cassette....and break my legs.