AMD Turion 64 Mobile MT37 vs Mobile Sempron 3000+

Hello all,
I am considering purchasing a processor upgrade for my HP Pavilion
ze2401xt notebook PC. After a nice chat with an HP online technician
and acquiring a copy of the service manual for my ze2000 series HP
Pavilion, I have found that I can upgrade the processor that came with
my HP from the current AMD Mobile Sempron 3000+ (1.8Ghz, L1 Cache
64K+64K, L2 Cache 128K, 1.400v, 62w TDP) to an AMD Turion 64 Mobile
MT37 (2.0Ghz, L1 Cache 64K+64K, L2 Cache 1MB, 1.200v, 25w TDP).
My question is, would the performance gains of the upgrade be worth the
$209 that the MT37 costs?
Also, I have been reading that since the MT37's TDP is 25w vs the
Sempron's 62w that overall notebook should run cooler with the MT37.
Has anyone out there experienced this firsthand?

Any opinions, insight or personal experiences in this area would be
very much appreciated and looked forward to.

Thank you,
Paul_in_NC