Lighthouse Studio

It contains all the standard survey question types and many of the more complex / customised question types that other software includes. It has the ability to add customised features / programming via HTML, CSS, JavaScript, Perl, etc.

As with any software you become familiar with, it is easy to navigate your way around the menus and features within.

The Sawtooth Software support is world class. It consists of a vibrant online forum and a generous and friendly help desk direct from Sawtooth Software themselves. I rely heavily on their ongoing support.

I guess self interest kicks in here.

There are a couple of features I would love to see included such as a bulk emailer, carousels (programmed by Sawtooth Software rather than me) and file uploading within a survey.

Highly customisable. Tailored towards people who are developers or have a strong tendency towards developing and therefore more intuitive than other products that do have more pleasing UIs yet more cumbersome UXs.
It's one of the few solutions that provide good functionality when it comes to all types of Conjoint studies, MaxDiff etc.
Backwards compatibility in terms of "the interwebs" is pretty deep (supports browser and platforms way back) although that's also something that holds the software back more than it should.
Offline functionality works ok - although only on Android.

Innovation is lacking a bit. The overall architecture, look and feel of the software is almost unchanged in the past decade. Still relying heavily on jQuery and other libraries (which is totally unnecessary since almost everything can be done with vanilla JS and much reduced overhead!). The DOM and the structure comprises of a lot of jank. After all it's a web-experience and there are many things that can be improved upon to rise up to modern days web-standards to provide decent loading times, UXs for the respondents and make use of modern APIs and browser capabilities.
I wish there was a more open dialog with developers in terms of roadmaps, development cycles, including suggestions etc.
Offline functionality for iOS would be nice!

I have used Sawtooth Software since their first days of Ci2 back in the 90s. I've used their interviewing software (CATI/CAPI), went with to Ci3 and then Sensus as they entered the Web space. Their software has always been on point, giving you all of the features needed for a complete market research system.

Since the early days, I have morphed to different systems with different companies, but have come back to Lighthouse for its ability to help run MaxDiff designs. We set everything up in Sawtooth, transfer the design to our interviewing software, import it back to Lighthouse, run the scores and upload it to the online analyzer. Our teams, and even some clients really love the ease of the online analyzer that also includes TURF analysis side-by-side with the MaxDiff analysis.

They have SO many choices for researchers, sometimes it can be difficult to know which is best for you, but if you tell them what you are trying to do, they'll get you to the exact product/service/logic you need.