I absolutely love my PHIs. I've putted with OG medium for the past three years and I still revel in how much I like putting with them. The plastic is stiff with a slight give and grippy in all conditions. As putters go, they're a bit smaller diameter than most, and according to my friends, feel deeper than the putters they putt with. Before using these I putted with DD Wardens and to me, these seem to be much more consistent and fill out my hand more.  I've also tried OG Premium and OG soft PHIs for off the tee and they are massively different discs.
Out of the box the Med and soft plastics are high torque resistant discs that'll hold whatever angle you put it on. The premium flies like an aviarx3 with no glide, and the soft plastic has become my lumpy-full power slight hyperflip to late turn putter shot off the tee. I recommend these to anyone that likes beadless putters with grippy plastic.
 

This is the best beadless putter I've used. Similar to a deeper Luna or a straighter P2 with  a ton of glide. Amazing off the tee and in the 25-50 foot range. Highly recommend!

Saw this at a local pro shop and picked it up. I like the EV7 Penrose to putt with so I gave this a shot. The numbers it shows on the disc are 3/4/0/1 and it seems pretty true to these numbers. I took it out on a round on a very wooded course with some technical shots and it performed beautifully. Throws very straight for a drive and also held a very nice anhyser line and jump putted very well. 
Overall it is a great, straight approach disc that is very beginner friendly and also very versatile for any level of player. Highly recommend.