Whether this is a suitable fund depends on about 101 varables unique to your situation. Such as, what is the make up of the rest of your portfolio, is your key objective growth or income, and how soon do you anticipate needing this money.
To me, any portfolio that is being constructed for a 5 year plus time window can do very well with this type fund among the 10 percenters. In the 10 % category I also include REITS, Emerging Markets, Small Country debt. Other more traditional fund types deserve more than 10 % IMO.
As I noted earlier, your fund has had a nice 5 year run, so if it fits, keep it and hope the run continues.