Sat here for the Oakland A's game last April. Had an awesome time at the game and loved our seats in row 6 which was halfway up the section. Stairs were a little steep but show me a ballpark where this isn't the case. Plenty of railing though. Seats are right, very little space for your knees and very little room for your elbows. The bigger you are in size, the less likely you will enjoy your seats on the upper level.
Would love to sit in 344 again, it's season ticket worthy.