As far as we can tell, the Handi-grip forend is the same as the checkered new style black and camo forends, same length and look identical, there are comparison pics in Mac's thread a month or so ago which I think is in the FAQs. I've got the syn checkered monte carlo set on my 35 Whelen Impr, it works fine from the bench, both on bags and in a LeadSled, all I did was add a Limbsaver prefit pad. I've shot 200gr and 225gr loads so far, have 250gr Hornady RN to shoot next time we get some dry weather. I've only seen one shooting report on the Handi-grip t-hole stock, a 25-06, but Mac will be reporting on it on his custom 30-06...... soon hopefully.

As to my preference, the checkered syn stock set is my new favorite of all of their stocks, but haven't tried the Handi-grip butt yet, the Survivor isn't in the running and useless to me, may be fine for plinking which I don't do, the Varmint forend is great for a bipod and strickly bench shooting from bags, the checkered syn forend is a great compromise for carry and bench work on a hunting rifle, IMO.
Tim