If you're under 500 watts, do yourself a favor and invest a few more dollars to purchase the Gain-Master from H&Y Electronics. The signal increase over the Imax is well worth the extra $45 and the appearance is very similar with no radials.
I would agree with SW even though I've not seen any reports comparing the Imax vs. SGM. But, to answer both BM and SW, maybe T23 wants the simplicity of the Imax. The only thing so simple and that really works well like the Imax is the A99 in my opinion. Under those circumstances I would not hesitate on the Solarcons.
My A99 works better than my Imax.
I may get it up to compare to my Gain Master and then I'll have more to say no mater how that turns out.