Hi Brittany,
What are your current stats? Starting weight and height etc?
I am in Week 7 of CS and have lost 14lbs (ie: 1 stone) in the first 6 weeks and I'm quite happy with that. I usually have a bar for breakfast, mid-morning snack, shake for lunch, mid-afternoon snack and then a low carb meal and fruit afterwards. So my losses have been quite steady each week and I'm happy losing about 2 lbs per week cos I get to eat real food and I am never hungry!
I know Charlotte is doing CS on Sole Source which means she doesn't eat solid food (please correct me if I am wrong, Charlotte). She has seen bigger losses because she is doing SS. I applaud her for her determination because I know I couldn't do it.
Are you planning on doing CS with a low carb meal or doing it Sole Source?
You have about 9 weeks from 25th March to 2nd June so even if you were to lose about 2 lbs per week - you would be able to lose 18 lbs! So you will be most of the way there before you go on holiday....
I actually don't think CS is that expensive compared to CD and LL and other similar diets. One box of 14 shakes retails for about £25 which covers you for breakfast and lunch for 7 days. It costs about £3.57 per day for breakfast and lunch which I think is reasonable. My weekly shopping definitely used to cost more than that!
It's up to yourself at the end of the day. I personally love this diet and would recommend it. The shakes taste lovely! And after getting past the 1st few days, the hunger goes! And we get to eat 6 times a day!
Where are you going on holiday btw?
Hope some of that ramble above helped.

Please let us know if you have any more questions on CS.
Love Lisa
