I'm probably gonna get over ruled on this one, but my personal opinion is that would be a great beginner bike, first reason is, a 250 has more torque than a 125, you can ride a gear higher or so and have manageable power for a beginner, and you can grow into the power the bike has in it's mid range as you learn. Secondly it is an inexpensive and relatively simple bike to maintain, it wont break the bank as a 4 stroke might.
what year we talking about? if it is in good condition and 1200 may be a killer price