I would actually rate OneTravel.com as 4-1/2 stars rather than just 4 stars. The website is user friendly and customer service is responsive. I used OneTravel.com because they offered the best prices on air and hotel for my and my boyfriend's Punta Cana, Dominican Republic vacation two weeks ago, October 17th - 21st. Our non-stop flight via AirTran was wonderful and although the hotel (Iberostar Punta Cana) rates itself as a 5-star hotel, OneTravel.com was right on point with their 3-1/2 star rating (the food will get you full but you won't rave about it). Our only true regret was that we couldn't stay longer...in spite of the food!
I do have one suggestion; it would be great if OneTravel.com offered suggestions for transportation service to/from your hotel, especially for international destinations. We took a cab to/from the hotel which turned out fine, but it would have been nice to already have those arrangements made.
Other than that, I would, without hesitation, recommend OneTravel.com to friends and family.
Thanks for a great trip OneTravel.com!
J. Bryant