I started out with a nickel M38 and bought a M342. I love the Bodyguard style -- I really wish S&W had made a Bodyguard in titanium, but those are the breaks.
The four ounce weight savings is significant if you use pocket carry. Otherwise, if you carry on your belt, it's not going to make much of a difference, especially considering the price differential (around here, $386 for M638 vs. $509 for M342).
Justin
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Justin T. Huang, Esq.
late of Kennett Square, Pennsylvania