I've used G Adventures twice. The first time, nearly ten years ago in Mexico and Guatemala, was a very good experience. The second time--not so much. I went on a tour of Burma and there were a number of issues. I realize that Burma is going to have problems due to the sudden influx of tourists after so many years of near isolation. But even taking that into account, G Adventures could have done better. First of all, I paid G Adventures for a taxi from the Yangon airport to the hotel. $60. At the end of the trip I got my own cab (for $10). So G Adventures drastically overcharged.
The hotel in Yangon was a hole--miserable place. G Adventures had arranged for me to stay three extra days in this hotel at the end of the trip (I had to stay the extra days because I wasn't able to get an earlier flight home). My tour stayed in a *much* nicer hotel in Yangon a couple of days later so I said to the tour guide "Could you get in touch with your colleagues and change the hotel at the end of the trip for me?" I was giving G Adventures more than two week's notice to cancel the flea bag hotel and book a room in the superior hotel (and I was willing to pay any extra fees or penalties). The tour continued, weeks passed and I never did get an answer from my guide--despite repeated requests. How hard could it be? In the end I never did get a refund on the terrible hotel so I ended up losing more than $300. When I returned home from the trip I wrote the tour guide and asked "The issue of the hotel was never resolved, but the tour is over so you don't have to worry about it. Could you give me the contact names at G so I can get in touch with them?" He never bothered to reply. Nice! After a few e-mail exchanges G Adventures agreed to credit me the amount on my next trip, but it's unlikely I'll take advantage because I won't use them again. The hotel mess, along with other blunders really disappointed.
Before the trip G Adventures kept sending out conflicting e-mails. ATM machines are not available in Burma. Then ATM machines ARE available in Burma (wrong). The Golden Rock site is open and on the tour. Then: the Golden Rock site is closed for restoration (also completely untrue). How could they foul things up so badly? And remember the first horrible hotel that we stayed in? That was the third or fourth hotel that G Adventures booked. I'd receive an e-mail saying "You'll be saying in ABC Hotel in Yangon." Two weeks later: "Oops. No, you're staying in DEF Hotel." Two more weeks later: "Sorry! You're now staying in GHI Hotel." All that poor communication and endless changes to stay in one of the worst hotels of my life.
So--in the end I won't use G Adventures again. From what I heard from others during the tour, there are other tour companies that do a much better job.