I did not look into Primo, but I think I did watch a video where they were doing a cook-off to compare themselves to a BGE.
I don't think a 12# turkey is too ambitious. Although, it could be a little stressful for you if you are cooking for a lot of people & you have never tried it before. Essentially you are just cooking the bird at 350F until it is done. But, you will be trying to get the fire right for the first time, trying to figure out how to do a new recipe for the first time, etc... Not impossible, but not as easy as throwing a bird in the oven. Recipe here:
http://www.biggreenegg.com/features/smoked-turkey/
Here is a video of a guy getting a fire going in a BGE. I thought this was very helpful when I got my BGE:
[youtube]6n9GPqWXnUg[youtube]
ONe piece of advice I wish someone had told me when I got my BGE... the thermometer that comes with it may or may not be calibrated. First thing I would do is boil a pot of water & make sure the temp gague reads 212F. (the guage pulls out of the BGE easily). If you do get it, I think a remote monitor is a must-buy accessory... something like this (doesnt have to be this brand - just ask for one wherever you get your egg
http://www.amazon.com/Maverick-Industries-RediChek-Wireless-Thermometer/dp/B0000DIU49 )
BGE comes in XL, L, M, S, Mini. Get at least a L. Get an XL if you need to cook for a lot of people. From
www.biggreenegg.com:
XLARGE
The Biggest Green Egg of them all provides a cooking area that can easily accommodate meals for large families and cookouts with all your friends – and you can efficiently prepare several meals over the coals at once. Ready to serve up fourteen racks of ribs, twenty-four burgers or a couple of holiday turkeys with all the trimmings? No problem!
LARGE
The Large EGG is the most popular size and a favorite to handle the cooking needs of most families and gatherings of friends. Accommodates all EGGcessories for baking, roasting or smoking – and it’s versatile enough for weekend cook-outs or pizza parties, large enough for eight steaks at once, and efficient enough for an impromptu meatloaf for two!
MEDIUM
Happiness in a smaller package – the Medium EGG is perfectly sized for smaller families and couples, and accommodates all the most popular EGGcessories like the Plate Setter and Baking Stone. Get all the famous Big Green Egg versatility and efficiency in a smaller package with plenty of cooking area to accommodate a backyard cookout of four steaks or two whole chickens.
SMALL
Big Flavor in a compact package! The Small EGG is an easy fit for smaller patios and balconies, and is able to prepare four burgers or chicken breasts at a time. The small Egg is often used as a companion for the XLarge, Large or Medium EGG to allow the preparation of several courses at once, and is perfect for restaurants seeking the performance of an EGG in a size to fit a commercial kitchen.
MINI
A MINI EGG is the perfect solution for picnics and tailgating when you want to take The Ultimate Cooking Experience with you! It is also a popular size for grilling on apartment balconies or camping and boating. Leave those propane canisters at home and enjoy your favorite campfire meal on the MINI!