Can anyone comment on the gen 300 low disturbance openers?or any other brand for that matter... I am thinking about replacing my 4" shovel with split boots on a morris 9000 cultivator with the gen 300 with gen 64 tips. The cost with shipping and taxes is 9400! im just wondering if the cost of these low disturbance openers is worth the extra expense. Also it would cost about 2600 less without carbides. Is the carbide worth as well?