My Bernina 830 has it also.

I have a Pfaff with the built in dual feed and it works great.
That is the only way to go is with one that has that feature. :-)

I have the Pfaff Smarter C1100 and several others but the Pfaff is the one dual feed is the best. I would recommend the Pfaff Smarter C1100 for the feed and large harp.

Pfaff, Pfaff, Pfaff. Most other machines that have a dual-feed require you to put on a special walking foot to do that. Pfaffs have it built in, and I LOVE both of mine (Varimatic 6091 and Creativ 1475).

I have a Pfaff and the IDT is great for piecing. But, I found out that the walking foot on my Bernina is better to sew bindings on. The foot holds the fabric down better.

The Bernina 820 and 830 both have it, and it is adjustable, so you can increase or decrease the top feed rate as needed!

http://www.youtube.com/watch?v=5B0rsKWm0GY

I have the janome 6600 with Accufeed and love it!

I have the Babylock Quest Plus that has the IDF (they call it PDQ) that is exactly like the Pfaff. All the feet (a lot) that came with it can be used with the IDF, so there is no changing shanks. I really like this machine and would buy it again. It is being replaced by the Serenade. I have a few machines, but would not buy another one unless it has the IDF.

I have the Janome Horizon with accufeed. I have the 1/4", STID, open toe and standard accufeed and use them all the time. In addition, because of the accufeed there is an extra high position to lift the presser foot and it really helps when making bowls and bags. I also love the big harp,

i am fortunate to have 3 Pfaff machines and love the walking foot. The NEW Pfaff's however, are being made in China.