My friend bought one NSR150SP, i rided for a while, and i don't like it. Its acceleration is poor, and not even keeping up with the 125cc. The tyres are thin so there won't be much confident when it comes to corner, the balance of the bike compare to NSR250 is damn poor. If you are after any performance or a fun bike to ride, you'll probably disappointed and for sure you'll be disappointed of the 150 if one day you ride a NSR250. But to get around as a form of transport and not looking for speed it should be a good reliable bike. Expect acceleration be equal or less than the CBR250rr.
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MC28, Repsol