Wow, FMQ with a twin needle ?!?!
 

I agree with Tartan. If you were doing a wall hanging or a table runner it might be okay but for a bed quilt I wouldn't like it because the quilting on the back would be too bulky.

good points, ladies. hadn't thought of that

All you need to do is use a small print for the back to hide those zig-zag stitches, or use thread in the bobbin that matches the color of the back. Many of my FMQ stitches are barely visible on the back.

I love how it looks. I was also concerned about what it would look like on the back.

For wallhangings I quilt the top with thin batting, and then the back with thin batting. I then layer the two pieces and bind. No worry about how the back looks, there is no back. All the quilting was done on the top. LOL

I don't see why the back would look any different than the front.
That is, providing you have it sandwiched well, so that there is no puckering in the back.
But that goes for whether it is one or two needles.

If you like the look on the topside ... you should like the back view too.

That being said, it would be better used for an open FMQ design (without intricacy), in order to show the beauty of it. Like a ribbon falling and flowing.

Just be sure to change your needle plate to allow for the double needle ... and choose a double needle with the widest spacing you can get.

The stitching on the back will be a zig zag the width of the double needle...if you want zig zag stitches on the back, your choice....the stitch IS NOT the same as the front.

They will be different because when using twin needle on the top there is still only one bobbin (two needles, one bobbin for bottom thread) so you get the zig zag look instead of the same stitching as on the front.