The quality of custom suits can vary a great deal from one custom suit maker to another.
The big question is how you want to look in it, what level of quality do you desire and ultimately, how important is the fit to you. I always suggest clients invest their time to gain a better understanding of the level of quality that each tailor makes.
Typically, internet tailors and traveling tailors make suits that are all machine made and rarely fit properly. This option can require extensive alterations and several long distance fittings which can make this method a long and stressful process. It can also be a major inconvenience if the order is time sensitive or for a special occasion.
Do your research, and take the time to establish a personal relationship with a reputable and professional local clothier. This will ensure that you will have the best opportunity for a favorable outcome.