Just received my HP 50G, just in case some of you are curious about how the keyboard compares with the other HPs.
I have a 2004 49G+ that is rarely used, the key on the 50G is slightly better, it does not have the 49G+'s hollow feel when the keys reach their full travel, but pressure required for the key press is not significantly different.
48 keyboard it is not, I have a 48SX and a GX, both calculators have keys that are easier to press, more tactile, and less clicky than the 50G.
If you go back and compare with the older models, it is not in the same league as the Spice, Woodstock, and Classics (I compared it with several calculators of each series I own to avoid sample variation).
In case you are wondering, the 41 Series still has the best keys of all HP calculators.
In conclusion, the keyboard improvement over the 49G+ is very marginal if you have a good 49G+. You may want to think twice before buying a 50G for the keyboard improvement alone. You are definitely not getting the 48 Series keyboard feel on the 50G. Its feel is a lot closer to the 49G+ than the 48GX.
Buy hey, I am not complaining, it is a small step in the right direction. Given the minimal changes, I would not have called it a new model myself though.
I hope this helps you in your 50G purchase decision.