Before and raunchy comments come flying in, I've used the search function several times to find a thread with actual comparable info on the these items and it's kinda all over the place so I thought i'd just settle it with all my fellow FRF user's personal opinions and experiences. Few different questions I'd like to go over with this thread: 1. I've read Geisers are progressive, like the OEM springs, and Eibach's are linear. How does the ride difference change from going OEM (progressive) to Eibach's linear in terms of a daily driving raptor, or for lack of a better term, pavement princess? 2. A few knowledgable people have told me perch collars were very popular when gen 2's came out because it was the only option at the time. But now that aftermarket springs have come out providing the same "leveled" look that collars provide, it's a better route to go with springs over perch collars. Why is this? I believe I saw one user post something along the lines of if you throw geisers/eibachs on you lose suspension travel, and you don't with collars? 3. If I go the spring route and buy some geisers or eibachs, do they require any other piece of equipment to function properly? Kind of a cluster. I'd like to either purchase springs or collars to level my truck out a bit but I've read several pros and cons with each. I don't plan to purchase rear leafs for a little while as I'm about to blow quite a bit of mula on some lights but that's another story so the rear is going to stay OEM for a minute. Thanks all for the input!