Wont really have alignment issues or cause problems but there customer service and cost would keep me from ever buying there stuff.
When people level or lift the front end and have issues its usually because the drag link and track bar are at a steeper angle which puts more leverage on the joints, often they are not strong enough to handle the added stress and that is where poor handling or DW come from. The coils or spacers used cant cause problems themselves but its the by product of lifting the front end that causes the problems though all fixable.