OP - i suggest contacting some of the plan providers and exploring this for yourself. Its really a business decision.
I have my own practice - tax, EP, business, etc - and when i went solo i looked into this. i declined, it just wasnt worth the hassle. the fee caps they impose are absurd.
i discussed this with 2 particular lawyers i know who participated, both disliked being involved. 1 said most clients he ended up meeting with didnt even use him because his base documents he provided for the price the PPL company would pay were rarely sufficient for what the client wanted. in other words, the clients wanted more than he was wiling to do for the PPL rates, and the clients got pissed when they were told it would actually cost them money, the PPL beenfift wouldnt cover what they wanted.
the 2nd lawyer just hated keeping track of all the files and other stuff that goes along with a client practice generally - conflict checks, time and staff resources, etc. - given the reduced rates.
its a lot like medicare - dont expect these clients to be profit centers from the work covered by the PPL plan. view them as loss leaders which make sense if there's potential other work.