Generally trusts are advisable for the reasons given before.
However, a word to the wise. If the annual premiums to the life assurance plan are over £3,000 per annum you may need to prove that the premiums are easily affordable from your income and do not diminish your standard of living or the premiums may become subject to Tax. This is quite unlikely unless we are talking about a whole of life plan.
A second point to be aware of is that you should ensure that there is no cash in a discretionary trust at the 10 year point. This would only happen if the life assured died before the 10th aniversiary, and this does happen, then the policy proceeds are paid into the trust from the insurance company but not distrubited to the beneficiaries before the 10th anniversiary of the trust. You could face a periodic charge and an exit charge, but again this is very unlikely.
As well as appointing trustees that you trust, also try to ensure that they are significantly younger than the life assured so there would be a high probability of them surviving the life assured.
A discretionary trust, as the name suggests, means that the proceeds are paid to the beneficiaries at the discretion of the trustees. A nomination of beneficiaries is usually made by the life assured and generally the trustees do follow this. However if you are planning on leaving funds to your kids then best make all of them trustees to avoid arguments later (although this would be one argument that you can't get dragged into as it will only kick off after you've kicked the bucket!)
These are really the only potential downsides of using trusts for life assurance plans I can think of at the moment; but I am full of man flu so there could be more that are escaping me.