Gjc2128, I know you are looking at IWB, and I understand the attraction. I've owned several "tuckable" IWBs, including an Alien Gear and a Bianchi for my Shield. Maybe (probably) it is me, but getting a "tuckale" holster "tucked" so it doesn't look like I've got a gun under there or was drunk while dressing is very difficult.
So, going "untucked" leaves the issue that no matter what holster you use, there is a 'lump' there along the beltline and whatever shirt covers it needs to be loose enough not to print constantly.
With this in mind, and recalling the Shield's short barrel, I find that an On Waist Band holster conceals about as well as an In Waist Band. A classic pancake holester that rides fairly high can conceal under a shirt-tail and is (for me at least) far more comfortable than any IWB I've tried.
Nobody (I truly believe) ever buys just one concealment holster and actually uses it constantly for years. Get your IWB, but a little later recall this post and give a OWB pancake a try. Any time you can wear a sport coat, carrying IWB is just unnecessary discomfort.