Gap Travel - Through STA

Hi all,

I have been doing a fair bit of research to do with doing a trek to Everest Base Camp.

The long and short of it are STA Travel are the cheapest and most convenient and have used them lots of times before and they have been fine!

The Trek itself is through Gap Travel, has anyone got any knowledge of how good they are, or has anyone experienced any problems with them???

I would be grateful to hear any good/bad stories so i can make my mind up.

Thanks in anticipation,

Dan