Well, practice, practice, practice of course. This type of holster is meant more for deep concealment, so you have to accept the fact that it will be a little slower to access. I have one and use it often, but more in warmer weather. Under a pair of shorts, or even sweats it works well and is easy to draw from. Colder weather would offer more problems of course. Also, if you are carrying a few pounds extra, that obvioulsy makes drawing and holstering more difficult.
One thing I have to deal with in Ohio is the 'in plain sight' law for vehicle carry. It the weapon is not in plain sight it has to be locked in glove box or locked in a case and the case has to be 'in plain sight'. Of course 'in plain sight' is subjective. That makes the Smart Carry a poor choice sometimes, because it can be a little difficult to holster a weapon prior to leaving the vehicle, or at least doing so without alarming bystanders.
Another option that you may want to consider is the elastic style shoulder holster, worn under your shirt. Here's the link -
http://www.holstersrus.com/ - just go to the Concealed Carry Holster link. This is an elastic holster, but not the belly band type. If stretches around your chest instead. It's easy to adjust with a large velcro type fastener. It will easily carry a wide range of weapons, I've carried everything from a Makarov to a full size 1911, and also snubbie revolvers in it and it has room for an extra mag too. Access it pretty fast, once you practice a little. If you're wearing a flannel shirt or a light jacket, concealment is excellent.
Oh yeah, they also make a thigh version for when you are driving. Works great and it at least fits my definition 'plain sight'.