Suspension training has been made more popular with the TRX system. The best thing about this system is that it can be done anywhere and it is portable. This is great to take on vacation, overseas or on location where you are limited access to other types of fitness equipment.
If this is all you have under these scenarios, then it it will keep you in shape, but if you can do other activities in combination with TRX, you will get better results. This other activities will include, dumbbells, barbells, tubing, kettle-bells, stability equipment, cardiorespiratory and coming up with a great program design.