If the research does the proofing or the voice entry, your time gets you closer to the data. I find it takes between three and four hours per hour of tape, but I am well prepared for analysis at the end. Speaking the participant's views may add some perspective and depth. You get to add contextual notes or memos about contextual issues. This too may add richness and help keep data in context.
Qualitative research is time intensive.
The trade-off here is your comfort with a new technology and its equipment versus paying others for transcription and then having to check for accuracy and completeness. With grant funding, paying for transcription may be relatively easy, but proofing remains time consuming and offers a less extensive engagement with the raw data.