Phazer FX long track

[S.W.A.T.]

my buddy is selling his phazer it maybe has 200km and he wants $5500 for it. was thinking about buying it for the wife and kids to use. they would pretty much only be riding groomed trails and playing around in the fields with it.
I think the track is a 155
Is this a good buy??? Im not familure with these sleds at all as we have always been a 2 stroke family.