There are always 2 sides to every story and we could go down the PPM/PCM argument!

I have had a jet go down without one and then fitted one and have had no problems since.

I think you need to confirm the following. Are you using digital servos? Do you have long servo leads? Are you running 2 battery packs for your receiver? Do you have more than one servo connected to 1 channel?

If the answer to any of these is yes, then it will be of benefit to you.

Another benefit of these devices is that the receiver will have a constant voltage applied to it. Some of them also do away with "mechanical" switch and incorporate electronics switches.

The down side of it is also as you say, one more thing to go wrong.

The choice is always difficult but you need to feel comfortable using it! Good luck

Zane