I work for a SCUBAPRO Authorized retailer and I've seen three pairs come back due to breakage during the last year and those were used and abused heavily (and we've sold hundreds of pairs). All three came from Divemasters/Guides that had more than 150 dives a month. In our shop, we replace them, no questions asked. Also, during a recent SCUBAPRO product seminar the SCUBAPRO rep addressed it quite simply by stating that they would replace any broken fins on-the-spot.
I can't guarantee your dive shop in Bonaire would replace them but I rather doubt they're going to break during vacation unless you wear them out dancing at night...and then you deserve to break one.
BTW, I'm a little biased on this topic. I own two pairs (one white and one black). The white ones I wear when guiding (because they're easier to see) and the black ones when I spearfish or dive for fun. The only time I wear anything else is when I'm freediving and that's a whole 'nother thread....