Could anyone enlighten me on the differences between these two, the Ideale Models 4 and 6? My wife has been using the Model 6 and loves it and I have a chance to pick up a Model 4 but need to know what the differences are and if it would work for her. She's particular about *not* liking long saddles, so anything longer than the Model 6 wouldn't works for her.
Thanks in advance.
-S-