[RandomSeeded]

Re: response times, I don't think it's unreasonable to explain that you have additional interviews coming up. You're excited at the offer, but you want to explore your other options before making a final decision. Then get on the phone with the company/companies you really want to go to and get in for your onsite ASAP.

As has been discussed on HN ad nauseum, most exploding offers are pretty BS. A ton of time and money has been spent on you already, they want you, and the odds they rescind that if you ask for an extra week to decide are pretty slim. That said, by waiting you DO probably give up some of your ability to ask for extra $$...

One final note regarding the perception of playing the field. It was something I was concerned about when I was in the job search process. When people asked me where else I was interviewing, should I tell them? Doesn't that reveal that they're not, so to speak, my one true love? Had that exact discussion with the recruiting team at my current gig; turns out it generally makes you appear more desirable than disingenuous.