It is not so much working the bugs out. I think S&W figured out the bugs by 1900 on the double action revolver. It has more to do with just how lite the gun is. If you were going to use the gun (M329)in IDPA, or as a carry gun and shoot either Specials or warm specials through it then I say get it.
I really like the lite gun but NOT with the Mag loads. The barrel flip is huge, as well as the recoil with full house loads.
If something is comming to bite, claw, or what ever you. I want to be able to put 2 or 3 aimed rounds into said critter quickly. With the heavier gun I can almost double tap with full house loads. The airweight guns would be a struggle to get the gun back on target after the first round. If you add all the time from I see and know a threat to draw the gun, aim/ point, and fire you may not have a whole lot of time to get a second round off. And if both of your hands are holding the gun just over you left shoulder, you may have a hit bear on you with the gun aimed above him. And yes recoil with the lite gun moves my arms to the gun is verticle and both elbows are bent.
While the 44 mag is a great round and the 454-500s are better none are a nuke weapon and you may need more than one round to do the dammage you need to stop the thing that is intent on bitting or eating you. The 500 is the king of the bunch and still only has the energy of a 30-06 at the big hole. The 44 mag is out proformed by the lowly 30-30 in energy. For personal defence it is going to be a trade off of power, proformance, and portability.
Maybe if you loaded it so the cylinder was Special, special, MAG.Repeat. May give you the quick shots you will need if charged.
Also while learning to shoot the lite guns you may want to have a friend load the gun with specials, empties and Mags. One click on an empty and you know if you are flinching or pushing on the shot.