I'm a T2 on insulin and am having difficulties getting even control at the moment, having done well for a year on a combination insulin. We're going to start a basal/bolus regime this week, but starting very slowly with the bolus with meals first - as I'm spiking quite high after eating. But we discussed which insulins to use and Lantus was the basal we settled on, if/when I come to that stage. I'm hoping that some rapid with meals might be enough, without it.
The reason for choosing Lantus for me was that it has a very flat profile - this means that there are no major peaks and drops in the level of activity from the insulin in your system - and one of the reasons for choosing it for that was because I'm prone to overnight hypos with the combination insulins I've used. It looks like Lantus operates very evenly over a 24 hour period, so on its own, in theory, it should just supplement your natural insulin and help reduce BG levels overall - without any obvious dip because it doesn't peak in activity.
Lantus is used extensively by T1s as a basal insulin, so if nothing else, this will bump your post so that those actually currently using it can advise from experience.