Ease of Use: A few weeks ago I got a whole bunch of picks from Dunlop, including Fins; Jazz IIIs; Ultex; Tortex; Max-Grip and some special ones (stainless steel, aluminum, ...) of various sizes and shapes.
Although some picks take some time to get used to (i.e. Jazz IIIs, Fins), and others are probably aimed towards a more specific genre (i.e. the stainless steel picks), almost every Pick handles pretty well and sounds good. // 8
Sound: I tried every Pick with my Cort KX5 and my Orange TH30.
Fins: 3-in-1 pick: the sharp-edged side is aimed towards soloing; the thick-edged side is aimed towards rhythm playing; the jagged side is supposed to give you a 12-string feeling.
Jazz IIIs: These picks give you thick palm mutes, and really contribute to your technique IMO(such as pinch harmonics).
I also did a side-by-side comparison of the Ultex, Tortex and Max-Grip picks, and noticed that the Max-Grip are very similar sounding to the Ultex, which -when using distortion- gives you a grainy sound with a more pronounced high end, unlike the Tortex picks, which give you a smooth sound when using distortion, with more low end.
Keep in mind that thick picks give you a more pronounced low end, whilst thin picks give you a more pronounced high end; and sharp edges give you a brighter high end and round edges give you more of a dull sound. // 9
Reliability & Durability: I found that most of the Dunlop picks are unbreakable (especially the 1.0 mm and thicker picks), unless you use them in a way they aren't meant to be used (come on, we all use our picks as toothpicks and as objects to clean up the dirt that's under our nails).
Of course, picks thinner than .60 mm bend easily, making them unusable, but most of them (especially the Tortex and Ultex ones) are very sturdy.
They also come in various nice colors (green, blue, yellow, orange, ...), but it would be nice if they'd give them fluorescent colors, for us gigging musicians, who drop their Pick and can't find their spare ones in their pockets, since some of them slip somewhat easy. // 8
Overall Impression: People spend thousands of Euros trying to find the perfect sound, whilst some don't realize the difference a Pick makes. Playing a song with a thin round-edged Pick or playing it with a thick sharp-edged Pick makes a big difference.
Picks also contribute to your technique, I learnt how to do pinch harmonics way faster with a small Pick (e.g. a Jazz III pick). Using a smaller Pick also makes sure you only use the tip of your pick, like you should.
Since Dunlop picks are mostly only 0.50, you should really go to your local guitar shop and buy various shapes and thicknesses, you will find out it makes a big difference. // 9