I have been using ordinary manual subcision lifting for treating deep rolling and boxcar acne scars for over twenty-two years. There is no need to pay for bells and whistles machines to provide suction, since it is very simple to manually pinch the scar upward in order to access different levels below the scar. The use of a lifting filler, such as Restylane Lyft (which would be my choice in my Upper East Side Manhattan office) or Hyaluronica 2, which would be my go-to for this purpose in my Israel satellite facility, where a far greater number of regulatory agency approved fillers are available, can further improve the result of the subcision by providing immediate elevation and improvement and additional stimulation of new, native collagen and elastic fiber synthesis. Vis-a-vis microneedling, I am hardly surprised by its lack of success for you, given the deep nature of many of your scars. No technique is going to be particularly effective if it used for the wrong indication. Microneedling is NOT particularly useful for deep acne scars; it is most appropriate for blending surface color and textural irregularities that may persist following treatment with other modalities. In a recent lecture presentation at the 2016 American Society For Dermatologic Surgery meeting in New Orleans, a prominent laser physician herself admitted "microneedling is already replacing fractionnated lasers..." for treating "enlarged facial pores, in lieu of ablative and noablative fractionated lasers; various scars(from acne, trauma, surgery)...The skin wounds produced by microneedling enhance neocollagenesis, with minimal postoperative recovery, avoiding prolonged.. erythema often produced with heat-producing lasers." What this means is that microneedling may play a valuable added role following subcision lifting for your deeper scars and TCA CROSS for the ice pick (pit) scars. Make sure that you seek consultation and treatment by a board certified aesthetic physician with expertise in all forms of acne scar treatments and be cautious of any claims for "one size fits all" laser, radiofrequency or ultrasound devices. Best of luck to you.