All good advice as it's important to understand what kind of laws govern the type of device. Being in Mass, you may very well travel into neighboring states I'd imagine so it might behoove you to brush up on those states also.
You might find this helpful. This lists the type of radar/lasers used by state.
RDF Geographical Survey - Radar Detector & Laser Jammer Forum
Another consideration is to think about the types of roads you are intending on using the RD on. Little bit of everything vs. strictly on windy roads traveling through the countryside.
Personally, I use an Escort Max 2. What lead me to this was the fact that I could filter out false while driving in the metro areas but it had a decent range and decent processing capability.
There has been a recent firmware enhancement that filters out the blind spot monitors which has for several years been a problem. This release has been long overdue so I've learned, but has generally been very well received by owners of the Max/Max 2 line. I should also note that I purchased this before the Max 360 was out or I may have considered this one.
Important to note that if you are going to go with Escort, make sure you are buying from an authorized reseller otherwise you may be excluded from warranty services. You can read more about that here:
FYI Amazon, LLC is an authorized reseller so if you buy there, be careful to ensure you're buying form Amazon, LLC and not one of it's resellers.
With laser or instant on, you may as well write the check.