Full Tilt and Pokerstars have both gone to a blind structure that increases in small increments rather than making huge jumps in the mid-game.

Here is what Full Tilt usually uses

15/30
20/40
25/50
30/60
40/80
50/100
60/120
80/160
100/200
120/240/25
150/300/25
200/400/50
etc.

Pokerstars has antes kicking in earlier in some tournaments, but keeps similar small jumps in the midgame.

10/20
15/30
20/40
25/50
30/60
40/80
50/100/10
60/120/15
75/150/20
100/200/25
125/250/30
150/300/40
etc.

Merge's structure has big jumps in the midgame. This just zaps all the play out of the tournament.

5/10
10/20
15/30
25/50
50/100
75/150
100/200
150/300
200/400
300/600
400/800
500/1000

At the same point in the tournament (12 levels in), Merge's blinds are over twice as high as Full Tilt or Pokerstars! This is because of the big jumps that their structure takes!