Welcome aboard. Not a deal breaker. You can always have the chokes opened up. Not terribly expensive to do so.
Whether you consider it a disadvantage depends on the type of hunting you will be doing.
I would start by patterning the gun at maybe 20 yds and 40 yds and see how it is actually choked. The way it is marked on the barrels doesn't mean it actually shoots that choke. If possible use the same shells you will use to hunt. I believe there is a good chart at the Griffin & Howe web site that will tell you what % of pellets should be inside a 30" circle at various distances. If not there, just make a post here and someone will give you a site.
If you are hunting over a close working dog you may want at least the first barrel a little more open - personally I like it quite open such as Cylinder or Improved. I like the second barrel for pheasant over dogs at Mod. You will get alot of different opinions on this. None are right or wrong, it is really a personal choice.
If you are doing driven shoots with alot of 30 yd plus shots then you may want the barrels a little tighter - maybe Mod and Full.
If this is your only hunting gun, you may want it quite versatile. Maybe Improved and modified. Many folks at this site have a number of shotguns for different hunting situations. Shoot it for awhile before you decide to do anything.
