Bennetts did have an iffy reputation for customer service a while ago,.but they are now owned by Saga, and seem to have upped their game. I have my MT-09 bike insured with them. The people I've dealt with there recently have seemed very helpful, though I've not (touch wood) had to make a claim
A while ago I was with Carole Nash, and did have to claim, which they dealt with effectively. I did go back to them briefly a couple of years ago,as their quote was very competitive, but come renewal time the price had gone through the roof. Their advantage is that you get recovery and various other benefits as standard.