I am having such a hard time with this. I have a great rate, but I just can't get past that we ALWAYS have stayed on site with the dining plan. So, sell me on staying off for the first time
If you've always had a dining plan with TS, and if you focus on QS this time around, you may discover you really like being freed of that reservation schedule, especially if you're willing to eat outside the rush (i.e., get lunch no later than 11:30 and do dinner early or late). Will you have a car? The dining plan ties you to Disney; without that you can more easily try some of the great offsite restaurants without paying for a meal twice.
Who do you travel with, and where do you normally stay? If you're usually in a hotel room, the space in a condo is glorious!
Even if you've stayed in DVC units, unless you've been in the Grand Villas, the regular Bonnet Creek 2 BR is bigger than some DVC 2 BRs and better laid out than the rest, at least for a lot of people. There's a real DR table and seating for all, for one. And the kitchens don't have those weird little "half counter" things a lot of the DVC kitchens have.
No one can tell you whether you'll like being offsite more or not, but I can say that you'll never know 'til you try.
A lot of onsiters discover that going offsite means a much more relaxed vacation, or for some other reason end up enjoying offsite more than being onsite. And plenty of people love both equally, for different reasons, meaning they stay onsite when the deal is good, and offsite when that deal is better, and have a great time either way.