DC is not better than Lightspeed in customer service. I've never had to pay to get my 25XLs serviced, and they've done it over the WEEKEND before. I've also gotten free earseals from them just by asking, and it was just a minor comfort issue, the ones I had were almost new too, since they had replaced them just recently (also for free, and without me even needing to ask).
Not to mention that Lightspeeds are more comfortable, quieter, and cheaper than any DC models I've tried (cheaper with relation to comperable DCs). So some DCs are TSO'd. Can you honestly tell me how that matters to a general aviation pilot aside from inflating the price?