Hi,
Oh the million dollar question!.

If you can accept that sometimes the piece will not be perfect,but can look very good and be undetectable when done right,then a piece will work nicely,you have to be realistic about this,at the end of the day its hair basically glued to your scalp.
I have found with a age appropiate density,reasoanble colour match and blend you will have a workable solution for hairloss.but its never perfect.You have regular maintenance to deal with,but it gets easier.
Regards topcat