Looking at it as an out of cockpit weapon, laser pistols while expensive are a damn tempting choice. Range better than just about any other pistol, and most SMGs, even if not quite a rifle's range. Higher penetration than most ballistic weapons of similar size, and requires the enemy to have invested in higher grades of body armor to hope to stop any damage from it. Finally as long as you have a power supply to plug into reloads are not a concern.
However, looking at it, is the Inner Sphere pulse laser pistol worth it over a standard laser pistol? The PPS is the same, 2, the PLP is a 3E/2B, while the LP is 4E/3. A HCPP, or Clan PP is 30 points, or 15 shots from either. Standard PP is 10 from either. The ranges are close, the PLP is roughly 7/8s the LP's range. Both mass the same, and the PLP is 250 C-bills more
The issue is, well while the burst mode can, theoretically, raise the damage from a single shot? It can only do so by greatly increasing the power drain.
For example, for a situation where you have a target modestly armored against energy weapons, you'd need to double tap the PLP (and get the 2 MOS) to roughly equal the same end damage (3E/2+2 vs 4E/3), if say the target has ab/flak armor (5 vs Energy weapons). But to get that far the PLP uses twice the power. Triple and quad bursts only get one extra damage against an armored target like above, since as a single shot weapon the LP gets a bonus point of damage per every 4 MOS on the to hit roll. A PLP tops out at a 5 burst.
So ISTM that against a single target, the PLP only has a significant edge really works if you are A) targets that have no or cheap armor, and B) if you are willing to spend your power supply quickly. The only other advantage is a PLP can do suppressive fire, but that will drain a standard powerpack in a single long burst.