Rod
Just to offer some alternatives, the one our club has used without problem for the last year is
Aircraft Clubs . I believe it's free (I'm not actually the club organiser) or at least only a very notional charge.
[Edited to say that a check on the site shows that it's $4.95 / plane / month - sorry to have misled you. BRL - I'm not a salesman for them!!].
I have no experience of e-allocator, so cannot compare.