This kind of answer from Jeff (and other people) from the MPS team is in part what made me enjoy using MPS. Should you have any issue with MPS, if you send an email to the mailing list, you will always receive a kind answer, even in those cases were it is obvious you didn't read the doc.
I "worked" for months with Jeff and his team to find a real tricky bug to catch (well, they mostly did the work, I sent the bug reports) and they went above and beyond to find and fix that bug. (Remember the #1048 issue?)
I definitely recommend MPS, it will not "break your website".
I agree, Jeff and Otto have an amazing ethic and truly care for the project. I wish more project are lucky to have such leadership. Otto is no even with Google but has spent endless hours trying to help me and never tried to pitch consulting services although it seems that this is his business.
I "worked" for months with Jeff and his team to find a real tricky bug to catch (well, they mostly did the work, I sent the bug reports) and they went above and beyond to find and fix that bug. (Remember the #1048 issue?)
I definitely recommend MPS, it will not "break your website".