During the Jihad, the Inner Sphere went through something called "RetroTech craze". The Jihad was destructive in every possible way, and the need for weapons was greater than ever, yet the factory capacity wasn't quite there. Then some genius figured that they could manufacture primitive, Age of War-like 'Mechs more easily than modern equipment. It wouldn't be as good, naturally, but quantity has a quality of its own, as the saying goes.
In 3075, the Lyran Commonwealth needed cheap, easily produced scout 'Mechs for their planetary militias and other lower priority units (and for sale to mercenaries, it would be un-Lyran not to consider potential sales). This resulted in the aptly named Pathfinder, designated PFF-2. At 25 tons with 96 KPH maximum speed, it is an unremarkable design, but such is the price of using Primitive (or more properly, RetroTech) construction. Let's review what this means: The engine has 20% higher rating for same performance as standard construction would give, in other words more tonnage is used. The cockpit eats into payload mass as well, weighting 5 tons rather than the usual 3 tons. And finally, primitive units use Primitive Armor that gives only 2/3rds of the protection standard armor gives for the same weight (strictly speaking RetroTech units could use other armors but if you go for cheap, why bother?). This all results in another drawback: Attacks against Primitive (or RetroTech) units are more likely to cause critical hits.
The Pathfinder is powered by 180-rated Primitive Fusion engine rather than 150-rated SFE 25 tonners with 6/9 movement would usually use; while the resulting speed is average at best for its weight class, it is common speed in Lyran light 'Mechs and more than enough to keep up with their heavier designs. The Pathfinder's armor weights 6 tons for protection equal to the Lyran-staple Commando, with some armor shifted from rear and center front to the front sides and head. 10 standard heat sinks are used, enough for a simple machine like this.
Unlike rest of the 'Mech, its equipment is modern: Its sole armament is a right arm-mounted ER Medium Laser, and it also sports a modern high quality Beagle Active Probe granting it superior scouting abilities compared to old bug 'Mechs. Finally, though we do not have information about its exact sensor systems the BAP aside, it does possess Improved Sensors quirk (according to BattleMech Manual).
There is one proposed variant, which simply swaps the laser for a TAG. Since MUL lists a PFF-2T variant without record sheet, I am assuming it is the TAG variant mentioned in XTRO: RetroTech.
All in all, the Pathfinder is really what its name implies, a recon 'Mech and nothing more. Use it for scouting, and keep running without stopping to fight, leave that for others. It does have more range than old bug 'Mechs (likely machines used by raiders and pirates) but it also has less mobility and is more vulnerable to their attacks due to its lower spec construction. Against modern versions of those bugs... well, fortunately the Pathfinder is cheap.
Despite its drawbacks, as a 'Mech intended for militias, it is nearly perfect. It has more speed and range than infantry and is suited for supporting them, it is more mobile than vehicles in difficult terrain, and the Beagle Active Probe and the 'Mech's hands likely will find more use in search and rescue operations even if they never see use in combat proper. Anyone else will want something better though.
Other stuff:
The Pathfinder is from XTRO: RetroTech
There is no miniature for it.
http://masterunitlist.info/Unit/Details/4790/pathfinder-pff-2