I use a HK one which is exactly like the sky rc I think and they do have a timer but I personally don't like the timer it's a nuisance to me but some people prefer it, they will all do the job they are made to do and they are invaluable to have in my opinion. When it's time to buy a new one I prob won't be buying the same one again and will get the pro start one instead. With the one I have I run it with a 3s and I only get three 10min timed sessions before the battery is done cause they have an automatics cutoff with the timer system also that's what I dnx like about the Sky rc ones, so if you are going to go with the sky rc model run it with a 4s rather than a 3s I what I would advise
Edit: I should make it clear that the reason I don't like the timer is because of the automatic voltage cutoff if the battery gets below a certain level but apart from that the timer is a good function, in any case if you do run it with a 4s like I said earlier it should be ok.