Overall I had a good experience with EloBoost 24.
To be totally honest, it started out really rocky, as there was a lot of delay for the boost, and I got cycled between 3-4 different boosters, most of whom lost games or just didn't play much.
I was actually initially just going to cancel the boost entirely and try to get a refund, but fortunately the customer support was extremely helpful and willing to find a solution.
They ended up speeding up the wait, and were able to assign a new booster right away (Eddy), who was absolutely fantastic! He had nearly a 90% win rate, and completed the boost in all but 3 days. Very talented and friendly player.
So overall, I would say they made up for the initial delay, and in the end the boost was completed, and I was even given a extra bonus for the time spent cycling through boosters. I would definitely recommend EloBoost24, as they absolutely have the best customer service of any boosting site I have encountered.