I guess it depends on your use of the pack? The Icon Pro may be ok for day hunting but if you plan on hauling heavy/bulky loads you may want to take a look at Kifaru or Stone Glacier. Both of these packs are designed for 100+ lb loads.
The nice thing about Kifaru is once you have a frame you can order several bags. I have a bag for day hunting and another for hauling hefty-bulky loads. I almost exclusively use my larger bag except when scouting or hunting close to my truck. I can cinch the larger bag tight to the frame and am ready for a 100+ lb first load if I happen to harvest game. It is possible to customize Kifaru with different pouches, lids, and accessories. My bag has large exterior pouches for quick and easy access to spotting scope, tripod, raingear, etc.
Take a look at Kifaru and SG reviews. You likely won't find any complaints. If you are pinched for money you can likely find an almost new frame and bag on Rokslides classified adds, ebay, craiglsit, etc. for a fraction of the new price. If you do much hunting it is definitely worth the investment!