I remember I once had a SK strike team use what was effectively a mech that looked exactly like the Lyran Allaince's Fenrir power armour.
Had a panther assault cannon, 2 MMGs, and a rocket launcher. Pretty strong stats for a vehicle its size (15 armour, 10 body, +3 handling on a vehicle only slightly larger than a sedan).
Really their legs and small size was helpful in that it allowed them to make an assault against a compound in the middle of the woods without being spotted on the roads (the signature masking and chameleon coating also helped, but that's what you get with a 1.6M nuyen piece of military hardware).
Fortunately for my party at the time, they managed to finagle their way out of any sort of encounter, instead using them to actually take out the NPC for which a player had the Enemy quality.