These solicitors are not cheap - they will charge you more throughout the transaction.
The case handlers are overworked - too many files for them to handle
they will ignore you - be prepared for numerous chases and continuous delays
complaints are not being taken seriously- believe me they do nothing about complaints
threats that you’ll go to the legal ombudsman are not going to help
all you will do by using them is delaying your own sale / purchase and inflicting damage due to stress on yourself and others involved
I work for an estate agent - nationwide estate agent - and believe me their services are shockingly bad