If you have gotten away without lateral tilt in the past then I wouldn't be worrying about it now, unless your country is very undulating, mellon holely or steep then you really won't need it. It's just something else to wear or go wrong. Particularly if it is only a 25 ft front to start with. The 900 series front are not a bad front, generally feed very well with mimimal problems. But if you would like a new front for your machine, thats just a personal decision I guess, no doubt there are improvements on the 600 series, weather you NEED them is your choice.