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I stumbled on this thread when it first started, late at night and after a few beers.  I don't even know why I clicked on it as I tend to stay away from Charles Daly shotguns and similar firearms due to their past reputation for the most part.  But somehow I convinced myself to order a 601 DPS from Kentucky Gun Co. the next day before they raised their price $20-$30.  I received the gun last Tuesday (in 4 business days), brought it home and took it apart and lubed it.  I have never owned a Benelli M4 so I can only speak for what I see of this gun.  Like others have said, it seems solidly built.  The handguards are basic but fit well so nothing major there.  I was hesitant on getting a pistol gripped shotgun due to my last one beating my cheek up (870 with a collapsible stock), but the 601 DPS is very comfortable.  For me it shoulders nice and my eyes line up on the sights great.  The pistol grip is comfy and fits my hand well.  The buttstock has a decent recoil pad and doesn't have the hollow/cheap sound of a Remington SPS crap stock.  It doesn't beat my cheap up at all.
    Function wise, I only shot it with 2 3/4 target loads as that is all that I have except for some federal #1 buck from 2 decades ago.  I realize that this gun is not intended for dove loads but that is mostly what I have at the present time. It functioned 100% with Herters 7 1/2 1 oz loads (1290 fps) and Monarch 7 1/2 1 oz loads (1350 fps).  With Winchester 7 1/2 1 oz game loads (1290fps) it was 70% until I reached 300+ rounds of various ammo.  Now it seems to cycle all 3 at 100%.
    My biggest gripes are that the rear sight windage screw and sight platform do not have the "detent" to keep it from turning.  Mine would back out during extended firing and the ghost ring would move to the left. It's a shotgun, not a precision firearm so that is not a huge deal but it is something to keep in mind.  I loctited mine so we will see how that goes ($50 at Midwest gun works would solve this).  The second is the picatinny rail is not the same spec as an AR or similar.  Maybe its a weaver/picatinny mix or whatever but the width of the cuts/slots is .015-020 narrower that a true picatinny rail resulting in a Larue and ADM QD throw lever mount not fitting.  Again, not a big deal to me as I don't plan on putting anything on there anyway or if I did I'd just use a different mount system.  The trigger is long and creepy but has gotten better and like most shotguns you don't really notice it while firing.  My other issue or potential issue is parts availability.  It may break in the future or not and it may be compatible with Benelli M4 parts.  Which parts, I am not sure.  It does have a "warranty" but it's a Turkish shotgun so who knows how that might go as far as availability.  In summary, I like the gun as a fun range toy or maybe more depending on how it goes past the 300+ rounds I have put through it.

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You said $50 at midwestgunworks would solve your sight problem. Can you please elaborate and a link to the parts?

One word of caution DO NOT PURCHASE the Truckee forend because it simply will not fit the M4.  There is no way to pass the forend beyond the M4 gas pistons without "using a hammer".  I tried many angles to install that rail, both directions, rotating both directions.  There is a reason why there is NO Video showing the installation of the Truckee forend.  Noone would be willing to do this live because it can't be done without potential damage to the firearm IMO.  I have found other similar feedback.  As of now, over 3 weeks of e-mails, phone calls, Mesa Tactical customer service has not sent return postage for the Truckee.

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Does anyone have any tips on getting the Sulun collapsible stock installed?

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I purchased my 601DPS on Black Friday and upgraded a couple things. GG&G bolt release, Tango Arms charging handle, Taccom load assist for lifter, NDZ follower and left the 5 round mag tube as is, also match saver from Matchsaverz. I can confirm that the buttstock and recoil assembly are not compatible for the Mesa buttstock. Need the smaller Benelli 3 pos tube which are always out of stock on midwest and Benelli store. Does anyone have any idea if the Sulun Tac-12 tele stock will work with the factory recoil assembly tube? I love this shotgun and put 500 shells thru it with 1 FTE.

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What is everyone’s experience with installing the Sulun collapsible stock on the 601dps? I just finished installing mine and I am finding that the grip will spin back and forth slightly. Is this normal?